syncthing/lib/connections/relay_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"
"github.com/syncthing/syncthing/lib/relay/client"
)
const relayPriority = 200
func init() {
dialers["relay"] = relayDialerFactory{}
}
type relayDialer struct {
commonDialer
}
func (d *relayDialer) Dial(ctx context.Context, id protocol.DeviceID, uri *url.URL) (internalConn, error) {
inv, err := client.GetInvitationFromRelay(ctx, uri, id, d.tlsCfg.Certificates, 10*time.Second)
if err != nil {
return internalConn{}, err
}
conn, err := client.JoinSession(ctx, inv)
if err != nil {
return internalConn{}, err
}
err = dialer.SetTCPOptions(conn)
if err != nil {
conn.Close()
return internalConn{}, err
}
err = dialer.SetTrafficClass(conn, d.trafficClass)
if err != nil {
l.Debugln("Dial (BEP/relay): setting traffic class:", err)
}
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, d.tlsCfg)
} else {
tc = tls.Client(conn, d.tlsCfg)
}
err = tlsTimedHandshake(tc)
if err != nil {
tc.Close()
return internalConn{}, err
}
return newInternalConn(tc, connTypeRelayClient, relayPriority), nil
}
type relayDialerFactory struct{}
func (relayDialerFactory) New(opts config.OptionsConfiguration, tlsCfg *tls.Config) genericDialer {
return &relayDialer{commonDialer{
trafficClass: opts.TrafficClass,
reconnectInterval: time.Duration(opts.RelayReconnectIntervalM) * time.Minute,
tlsCfg: tlsCfg,
}}
}
func (relayDialerFactory) Priority() int {
return relayPriority
}
func (relayDialerFactory) AlwaysWAN() bool {
return true
}
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func (relayDialerFactory) Valid(cfg config.Configuration) error {
if !cfg.Options.RelaysEnabled {
return errDisabled
}
return nil
}
func (relayDialerFactory) String() string {
return "Relay Dialer"
}