mirror of
https://github.com/octoleo/syncthing.git
synced 2024-12-23 11:28:59 +00:00
107 lines
2.6 KiB
Go
107 lines
2.6 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 https://mozilla.org/MPL/2.0/.
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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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"math/rand"
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"net/url"
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"os"
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"time"
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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/dialer"
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"github.com/syncthing/syncthing/lib/protocol"
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)
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func init() {
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factory := &tcpDialerFactory{}
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for _, scheme := range []string{"tcp", "tcp4", "tcp6"} {
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dialers[scheme] = factory
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}
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}
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type tcpDialer struct {
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commonDialer
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registry *registry.Registry
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}
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func (d *tcpDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, error) {
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uri = fixupPort(uri, config.DefaultTCPPort)
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timeoutCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
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defer cancel()
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conn, err := dialer.DialContextReusePortFunc(d.registry)(timeoutCtx, uri.Scheme, uri.Host)
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if err != nil {
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return internalConn{}, err
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}
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err = dialer.SetTCPOptions(conn)
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if err != nil {
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l.Debugln("Dial (BEP/tcp): setting tcp options:", err)
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}
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err = dialer.SetTrafficClass(conn, d.trafficClass)
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if err != nil {
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l.Debugln("Dial (BEP/tcp): setting traffic class:", err)
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}
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tc := tls.Client(conn, d.tlsCfg)
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err = tlsTimedHandshake(tc)
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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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priority := d.wanPriority
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isLocal := d.lanChecker.isLAN(conn.RemoteAddr())
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if isLocal {
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priority = d.lanPriority
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}
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// XXX: Induced flakyness
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if dur, _ := time.ParseDuration(os.Getenv("TCP_FLAKY_LIFETIME")); dur > 0 {
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dur = dur/2 + time.Duration(rand.Intn(int(dur)))
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time.AfterFunc(dur, func() {
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tc.Close()
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})
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}
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return newInternalConn(tc, connTypeTCPClient, isLocal, priority), nil
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}
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type tcpDialerFactory struct{}
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func (tcpDialerFactory) New(opts config.OptionsConfiguration, tlsCfg *tls.Config, registry *registry.Registry, lanChecker *lanChecker) genericDialer {
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return &tcpDialer{
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commonDialer: commonDialer{
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trafficClass: opts.TrafficClass,
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reconnectInterval: time.Duration(opts.ReconnectIntervalS) * time.Second,
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tlsCfg: tlsCfg,
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lanPriority: opts.ConnectionPriorityTCPLAN,
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wanPriority: opts.ConnectionPriorityTCPWAN,
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lanChecker: lanChecker,
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},
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registry: registry,
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}
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}
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func (tcpDialerFactory) AlwaysWAN() bool {
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return false
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}
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func (tcpDialerFactory) 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 (tcpDialerFactory) String() string {
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return "TCP Dialer"
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}
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