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// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// +build go1.12
package connections
import (
"context"
"crypto/tls"
"net"
"net/url"
"time"
"github.com/lucas-clemente/quic-go"
"github.com/pkg/errors"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/connections/registry"
"github.com/syncthing/syncthing/lib/protocol"
)
const (
quicPriority = 100
// The timeout for connecting, accepting and creating the various
// streams.
quicOperationTimeout = 10 * time.Second
)
func init() {
factory := &quicDialerFactory{}
for _, scheme := range []string{"quic", "quic4", "quic6"} {
dialers[scheme] = factory
}
}
type quicDialer struct {
commonDialer
}
func (d *quicDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, error) {
uri = fixupPort(uri, config.DefaultQUICPort)
addr, err := net.ResolveUDPAddr("udp", uri.Host)
if err != nil {
return internalConn{}, err
}
var conn net.PacketConn
// We need to track who created the conn.
// Given we always pass the connection to quic, it assumes it's a remote connection it never closes it,
// So our wrapper around it needs to close it, but it only needs to close it if it's not the listening connection.
var createdConn net.PacketConn
if listenConn := registry.Get(uri.Scheme, packetConnLess); listenConn != nil {
conn = listenConn.(net.PacketConn)
} else {
if packetConn, err := net.ListenPacket("udp", ":0"); err != nil {
return internalConn{}, err
} else {
conn = packetConn
createdConn = packetConn
}
}
ctx, cancel := context.WithTimeout(ctx, quicOperationTimeout)
defer cancel()
session, err := quic.DialContext(ctx, conn, addr, uri.Host, d.tlsCfg, quicConfig)
if err != nil {
if createdConn != nil {
_ = createdConn.Close()
}
return internalConn{}, errors.Wrap(err, "dial")
}
stream, err := session.OpenStreamSync(ctx)
if err != nil {
// It's ok to close these, this does not close the underlying packetConn.
_ = session.Close()
if createdConn != nil {
_ = createdConn.Close()
}
return internalConn{}, errors.Wrap(err, "open stream")
}
return internalConn{&quicTlsConn{session, stream, createdConn}, connTypeQUICClient, quicPriority}, nil
}
type quicDialerFactory struct {
cfg config.Wrapper
tlsCfg *tls.Config
}
func (quicDialerFactory) New(opts config.OptionsConfiguration, tlsCfg *tls.Config) genericDialer {
return &quicDialer{commonDialer{
reconnectInterval: time.Duration(opts.ReconnectIntervalS) * time.Second,
tlsCfg: tlsCfg,
}}
}
func (quicDialerFactory) Priority() int {
return quicPriority
}
func (quicDialerFactory) AlwaysWAN() bool {
return false
}
func (quicDialerFactory) Valid(_ config.Configuration) error {
// Always valid
return nil
}
func (quicDialerFactory) String() string {
return "QUIC Dialer"
}
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