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 http://mozilla.org/MPL/2.0/.
package connections
import (
"crypto/tls"
"net"
"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 {
cfg *config.Wrapper
tlsCfg *tls.Config
}
func (d *relayDialer) Dial(id protocol.DeviceID, uri *url.URL) (IntermediateConnection, error) {
inv, err := client.GetInvitationFromRelay(uri, id, d.tlsCfg.Certificates, 10*time.Second)
if err != nil {
return IntermediateConnection{}, err
}
conn, err := client.JoinSession(inv)
if err != nil {
return IntermediateConnection{}, err
}
err = dialer.SetTCPOptions(conn.(*net.TCPConn))
if err != nil {
conn.Close()
return IntermediateConnection{}, err
}
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, d.tlsCfg)
} else {
tc = tls.Client(conn, d.tlsCfg)
}
err = tc.Handshake()
if err != nil {
tc.Close()
return IntermediateConnection{}, err
}
return IntermediateConnection{tc, "Relay (Client)", relayPriority}, nil
}
func (relayDialer) Priority() int {
return relayPriority
}
func (d *relayDialer) RedialFrequency() time.Duration {
return time.Duration(d.cfg.Options().RelayReconnectIntervalM) * time.Minute
}
type relayDialerFactory struct{}
func (relayDialerFactory) New(cfg *config.Wrapper, tlsCfg *tls.Config) genericDialer {
return &relayDialer{
cfg: cfg,
tlsCfg: tlsCfg,
}
}
func (relayDialerFactory) Priority() int {
return relayPriority
}
func (relayDialerFactory) Enabled(cfg config.Configuration) bool {
return cfg.Options.RelaysEnabled
}
func (relayDialerFactory) String() string {
return "Relay Dialer"
}