mirror of
https://github.com/syncthing/syncthing.git
synced 2024-11-17 02:48:57 -07:00
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// Copyright (C) 2016 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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package connections
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import (
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"crypto/tls"
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"net/url"
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"time"
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"github.com/AudriusButkevicius/kcp-go"
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"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/xtaci/smux"
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)
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func init() {
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factory := &kcpDialerFactory{}
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for _, scheme := range []string{"kcp", "kcp4", "kcp6"} {
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dialers[scheme] = factory
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}
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}
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type kcpDialer struct {
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cfg *config.Wrapper
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tlsCfg *tls.Config
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}
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func (d *kcpDialer) Dial(id protocol.DeviceID, uri *url.URL) (internalConn, error) {
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uri = fixupPort(uri, config.DefaultKCPPort)
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var conn *kcp.UDPSession
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var err error
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// Try to dial via an existing listening connection
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// giving better changes punching through NAT.
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if f := getDialingFilter(); f != nil {
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conn, err = kcp.NewConn(uri.Host, nil, 0, 0, f.NewConn(kcpConversationFilterPriority, &kcpConversationFilter{}))
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l.Debugf("dial %s using existing conn on %s", uri.String(), conn.LocalAddr())
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} else {
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conn, err = kcp.DialWithOptions(uri.Host, nil, 0, 0)
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}
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if err != nil {
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l.Debugln(err)
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conn.Close()
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return internalConn{}, err
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}
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opts := d.cfg.Options()
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conn.SetStreamMode(true)
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conn.SetACKNoDelay(false)
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conn.SetWindowSize(opts.KCPSendWindowSize, opts.KCPReceiveWindowSize)
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conn.SetNoDelay(boolInt(opts.KCPNoDelay), opts.KCPUpdateIntervalMs, boolInt(opts.KCPFastResend), boolInt(!opts.KCPCongestionControl))
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ses, err := smux.Client(conn, smuxConfig)
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if err != nil {
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conn.Close()
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return internalConn{}, err
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}
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ses.SetDeadline(time.Now().Add(10 * time.Second))
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stream, err := ses.OpenStream()
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if err != nil {
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ses.Close()
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return internalConn{}, err
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}
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ses.SetDeadline(time.Time{})
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tc := tls.Client(&sessionClosingStream{stream, ses}, d.tlsCfg)
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tc.SetDeadline(time.Now().Add(time.Second * 10))
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err = tc.Handshake()
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if err != nil {
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tc.Close()
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return internalConn{}, err
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}
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tc.SetDeadline(time.Time{})
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return internalConn{tc, connTypeKCPClient, kcpPriority}, nil
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}
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func (d *kcpDialer) RedialFrequency() time.Duration {
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// For restricted NATs, the UDP mapping will potentially only be open for 20-30 seconds
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// hence try dialing just as often.
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return time.Duration(d.cfg.Options().StunKeepaliveS) * time.Second
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}
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type kcpDialerFactory struct{}
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func (kcpDialerFactory) New(cfg *config.Wrapper, tlsCfg *tls.Config) genericDialer {
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return &kcpDialer{
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cfg: cfg,
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tlsCfg: tlsCfg,
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}
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}
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func (kcpDialerFactory) Priority() int {
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return kcpPriority
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}
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func (kcpDialerFactory) Enabled(cfg config.Configuration) bool {
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return true
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}
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func (kcpDialerFactory) String() string {
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return "KCP Dialer"
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}
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