128 lines
3.3 KiB
Go
128 lines
3.3 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 go1.14 && !noquic && !go1.17
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// +build go1.14,!noquic,!go1.17
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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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"net"
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"net/url"
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"time"
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"github.com/lucas-clemente/quic-go"
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"github.com/pkg/errors"
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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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quicPriority = 100
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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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}
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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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var conn net.PacketConn
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// We need to track who created the conn.
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// Given we always pass the connection to quic, it assumes it's a remote connection it never closes it,
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// So our wrapper around it needs to close it, but it only needs to close it if it's not the listening connection.
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var createdConn net.PacketConn
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if listenConn := registry.Get(uri.Scheme, packetConnLess); listenConn != nil {
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conn = listenConn.(net.PacketConn)
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} else {
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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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conn = packetConn
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createdConn = 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 := quic.DialContext(ctx, conn, addr, uri.Host, 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{}, errors.Wrap(err, "dial")
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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{}, errors.Wrap(err, "open stream")
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}
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return newInternalConn(&quicTlsConn{session, stream, createdConn}, connTypeQUICClient, quicPriority), 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) 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{commonDialer{
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reconnectInterval: time.Duration(quicInterval) * time.Second,
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tlsCfg: tlsCfg,
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}}
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}
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func (quicDialerFactory) Priority() int {
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return quicPriority
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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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