mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-09 14:50:56 +00:00
1bae4b7f50
* all: Use context in lib/dialer * a bit slimmer * https://github.com/syncthing/syncthing/pull/5753 * bot * missed adding debug.go * errors.Cause * simultaneous dialing * anti-leak
121 lines
3.0 KiB
Go
121 lines
3.0 KiB
Go
// 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"
|
|
}
|