133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
// Copyright (C) 2019 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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//go:build go1.15 && !noquic
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// +build go1.15,!noquic
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package connections
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"net/url"
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"time"
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"github.com/quic-go/quic-go"
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"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/connections/registry"
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"github.com/syncthing/syncthing/lib/protocol"
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)
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const (
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// The timeout for connecting, accepting and creating the various
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// streams.
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quicOperationTimeout = 10 * time.Second
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)
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func init() {
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factory := &quicDialerFactory{}
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for _, scheme := range []string{"quic", "quic4", "quic6"} {
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dialers[scheme] = factory
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}
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}
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type quicDialer struct {
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commonDialer
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registry *registry.Registry
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}
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func (d *quicDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, error) {
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uri = fixupPort(uri, config.DefaultQUICPort)
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network := quicNetwork(uri)
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addr, err := net.ResolveUDPAddr(network, uri.Host)
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if err != nil {
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return internalConn{}, err
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}
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// If we created the conn we need to close it at the end. If we got a
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// Transport from the registry we have no conn to close.
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var createdConn net.PacketConn
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transport, _ := d.registry.Get(uri.Scheme, transportConnUnspecified).(*quic.Transport)
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if transport == nil {
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if packetConn, err := net.ListenPacket("udp", ":0"); err != nil {
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return internalConn{}, err
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} else {
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createdConn = packetConn
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transport = &quic.Transport{Conn: packetConn}
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}
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}
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ctx, cancel := context.WithTimeout(ctx, quicOperationTimeout)
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defer cancel()
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session, err := transport.Dial(ctx, addr, d.tlsCfg, quicConfig)
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if err != nil {
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if createdConn != nil {
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_ = createdConn.Close()
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}
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return internalConn{}, fmt.Errorf("dial: %w", err)
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}
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stream, err := session.OpenStreamSync(ctx)
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if err != nil {
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// It's ok to close these, this does not close the underlying packetConn.
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_ = session.CloseWithError(1, err.Error())
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if createdConn != nil {
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_ = createdConn.Close()
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}
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return internalConn{}, fmt.Errorf("open stream: %w", err)
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}
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priority := d.wanPriority
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isLocal := d.lanChecker.isLAN(session.RemoteAddr())
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if isLocal {
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priority = d.lanPriority
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}
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return newInternalConn(&quicTlsConn{session, stream, createdConn}, connTypeQUICClient, isLocal, priority), nil
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}
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type quicDialerFactory struct{}
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func (quicDialerFactory) New(opts config.OptionsConfiguration, tlsCfg *tls.Config, registry *registry.Registry, lanChecker *lanChecker) genericDialer {
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// So the idea is that we should probably try dialing every 20 seconds.
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// However it would still be nice if this was adjustable/proportional to ReconnectIntervalS
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// But prevent something silly like 1/3 = 0 etc.
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quicInterval := opts.ReconnectIntervalS / 3
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if quicInterval < 10 {
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quicInterval = 10
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}
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return &quicDialer{
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commonDialer: commonDialer{
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reconnectInterval: time.Duration(quicInterval) * time.Second,
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tlsCfg: tlsCfg,
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lanChecker: lanChecker,
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lanPriority: opts.ConnectionPriorityQUICLAN,
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wanPriority: opts.ConnectionPriorityQUICWAN,
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allowsMultiConns: true,
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},
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registry: registry,
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}
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}
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func (quicDialerFactory) AlwaysWAN() bool {
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return false
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}
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func (quicDialerFactory) Valid(_ config.Configuration) error {
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// Always valid
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return nil
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}
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func (quicDialerFactory) String() string {
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return "QUIC Dialer"
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}
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