2019-05-29 07:56:40 +00:00
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// 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 http://mozilla.org/MPL/2.0/.
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// +build go1.12
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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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"strings"
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"sync"
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"sync/atomic"
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"github.com/lucas-clemente/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/nat"
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"github.com/syncthing/syncthing/lib/stun"
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"github.com/syncthing/syncthing/lib/util"
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)
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func init() {
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factory := &quicListenerFactory{}
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for _, scheme := range []string{"quic", "quic4", "quic6"} {
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listeners[scheme] = factory
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}
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}
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type quicListener struct {
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util.ServiceWithError
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nat atomic.Value
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onAddressesChangedNotifier
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uri *url.URL
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cfg config.Wrapper
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tlsCfg *tls.Config
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conns chan internalConn
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factory listenerFactory
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address *url.URL
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mut sync.Mutex
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}
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func (t *quicListener) OnNATTypeChanged(natType stun.NATType) {
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if natType != stun.NATUnknown {
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l.Infof("%s detected NAT type: %s", t.uri, natType)
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}
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t.nat.Store(natType)
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}
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func (t *quicListener) OnExternalAddressChanged(address *stun.Host, via string) {
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var uri *url.URL
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if address != nil {
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copy := *t.uri
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uri = ©
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uri.Host = address.TransportAddr()
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}
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t.mut.Lock()
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existingAddress := t.address
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t.address = uri
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t.mut.Unlock()
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if uri != nil && (existingAddress == nil || existingAddress.String() != uri.String()) {
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l.Infof("%s resolved external address %s (via %s)", t.uri, uri.String(), via)
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t.notifyAddressesChanged(t)
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} else if uri == nil && existingAddress != nil {
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t.notifyAddressesChanged(t)
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}
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}
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func (t *quicListener) serve(stop chan struct{}) error {
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network := strings.Replace(t.uri.Scheme, "quic", "udp", -1)
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// Convert the stop channel into a context
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ctx, cancel := context.WithCancel(context.Background())
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go func() { <-stop; cancel() }()
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packetConn, err := net.ListenPacket(network, t.uri.Host)
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if err != nil {
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l.Infoln("Listen (BEP/quic):", err)
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return err
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}
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defer func() { _ = packetConn.Close() }()
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svc, conn := stun.New(t.cfg, t, packetConn)
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defer func() { _ = conn.Close() }()
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go svc.Serve()
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defer svc.Stop()
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registry.Register(t.uri.Scheme, conn)
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defer registry.Unregister(t.uri.Scheme, conn)
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listener, err := quic.Listen(conn, t.tlsCfg, quicConfig)
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if err != nil {
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l.Infoln("Listen (BEP/quic):", err)
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return err
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}
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defer listener.Close()
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l.Infof("QUIC listener (%v) starting", packetConn.LocalAddr())
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defer l.Infof("QUIC listener (%v) shutting down", packetConn.LocalAddr())
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for {
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select {
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case <-ctx.Done():
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return nil
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default:
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}
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session, err := listener.Accept(ctx)
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if err == context.Canceled {
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return nil
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} else if err != nil {
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l.Warnln("Listen (BEP/quic): Accepting connection:", err)
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continue
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}
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l.Debugln("connect from", session.RemoteAddr())
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streamCtx, cancel := context.WithTimeout(ctx, quicOperationTimeout)
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stream, err := session.AcceptStream(streamCtx)
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cancel()
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if err != nil {
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l.Debugf("failed to accept stream from %s: %v", session.RemoteAddr(), err)
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_ = session.Close()
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continue
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}
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t.conns <- internalConn{&quicTlsConn{session, stream, nil}, connTypeQUICServer, quicPriority}
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}
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}
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func (t *quicListener) URI() *url.URL {
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return t.uri
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}
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func (t *quicListener) WANAddresses() []*url.URL {
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uris := t.LANAddresses()
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t.mut.Lock()
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if t.address != nil {
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uris = append(uris, t.address)
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}
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t.mut.Unlock()
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return uris
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}
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func (t *quicListener) LANAddresses() []*url.URL {
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return []*url.URL{t.uri}
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}
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func (t *quicListener) String() string {
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return t.uri.String()
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}
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func (t *quicListener) Factory() listenerFactory {
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return t.factory
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}
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func (t *quicListener) NATType() string {
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v := t.nat.Load().(stun.NATType)
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if v == stun.NATUnknown || v == stun.NATError {
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return "unknown"
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}
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return v.String()
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}
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type quicListenerFactory struct{}
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func (f *quicListenerFactory) Valid(config.Configuration) error {
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return nil
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}
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func (f *quicListenerFactory) New(uri *url.URL, cfg config.Wrapper, tlsCfg *tls.Config, conns chan internalConn, natService *nat.Service) genericListener {
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l := &quicListener{
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uri: fixupPort(uri, config.DefaultQUICPort),
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cfg: cfg,
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tlsCfg: tlsCfg,
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conns: conns,
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factory: f,
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}
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l.ServiceWithError = util.AsServiceWithError(l.serve)
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l.nat.Store(stun.NATUnknown)
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return l
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}
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func (quicListenerFactory) Enabled(cfg config.Configuration) bool {
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return true
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}
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