syncthing/lib/connections/tcp_dial.go

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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package connections
import (
"context"
"crypto/tls"
"net/url"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/dialer"
"github.com/syncthing/syncthing/lib/protocol"
)
const tcpPriority = 10
func init() {
factory := &tcpDialerFactory{}
for _, scheme := range []string{"tcp", "tcp4", "tcp6"} {
dialers[scheme] = factory
}
}
type tcpDialer struct {
commonDialer
}
func (d *tcpDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, error) {
uri = fixupPort(uri, config.DefaultTCPPort)
timeoutCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
conn, err := dialer.DialContextReusePort(timeoutCtx, uri.Scheme, uri.Host)
if err != nil {
return internalConn{}, err
}
err = dialer.SetTCPOptions(conn)
if err != nil {
l.Debugln("Dial (BEP/tcp): setting tcp options:", err)
}
err = dialer.SetTrafficClass(conn, d.trafficClass)
if err != nil {
l.Debugln("Dial (BEP/tcp): setting traffic class:", err)
}
tc := tls.Client(conn, d.tlsCfg)
err = tlsTimedHandshake(tc)
if err != nil {
tc.Close()
return internalConn{}, err
}
return internalConn{tc, connTypeTCPClient, tcpPriority}, nil
}
type tcpDialerFactory struct{}
func (tcpDialerFactory) New(opts config.OptionsConfiguration, tlsCfg *tls.Config) genericDialer {
return &tcpDialer{commonDialer{
trafficClass: opts.TrafficClass,
reconnectInterval: time.Duration(opts.ReconnectIntervalS) * time.Second,
tlsCfg: tlsCfg,
}}
}
func (tcpDialerFactory) Priority() int {
return tcpPriority
}
func (tcpDialerFactory) AlwaysWAN() bool {
return false
}
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func (tcpDialerFactory) Valid(_ config.Configuration) error {
// Always valid
return nil
}
func (tcpDialerFactory) String() string {
return "TCP Dialer"
}