810 lines
23 KiB
Go
810 lines
23 KiB
Go
// Copyright (C) 2015 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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"crypto/tls"
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"errors"
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"fmt"
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"net"
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"net/url"
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"sort"
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"strings"
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stdsync "sync"
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"time"
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"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/discover"
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"github.com/syncthing/syncthing/lib/events"
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"github.com/syncthing/syncthing/lib/nat"
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"github.com/syncthing/syncthing/lib/osutil"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/sync"
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"github.com/syncthing/syncthing/lib/util"
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// Registers NAT service providers
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_ "github.com/syncthing/syncthing/lib/pmp"
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_ "github.com/syncthing/syncthing/lib/upnp"
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"github.com/calmh/suture"
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"golang.org/x/time/rate"
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)
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var (
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dialers = make(map[string]dialerFactory, 0)
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listeners = make(map[string]listenerFactory, 0)
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)
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var (
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errDisabled = errors.New("disabled by configuration")
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errDeprecated = errors.New("deprecated protocol")
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)
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const (
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perDeviceWarningIntv = 15 * time.Minute
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tlsHandshakeTimeout = 10 * time.Second
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)
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// From go/src/crypto/tls/cipher_suites.go
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var tlsCipherSuiteNames = map[uint16]string{
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0x0005: "TLS_RSA_WITH_RC4_128_SHA",
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0x000a: "TLS_RSA_WITH_3DES_EDE_CBC_SHA",
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0x002f: "TLS_RSA_WITH_AES_128_CBC_SHA",
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0x0035: "TLS_RSA_WITH_AES_256_CBC_SHA",
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0x003c: "TLS_RSA_WITH_AES_128_CBC_SHA256",
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0x009c: "TLS_RSA_WITH_AES_128_GCM_SHA256",
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0x009d: "TLS_RSA_WITH_AES_256_GCM_SHA384",
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0xc007: "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
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0xc009: "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
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0xc00a: "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
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0xc011: "TLS_ECDHE_RSA_WITH_RC4_128_SHA",
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0xc012: "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
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0xc013: "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
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0xc014: "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
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0xc023: "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
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0xc027: "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
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0xc02f: "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
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0xc02b: "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
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0xc030: "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
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0xc02c: "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
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0xcca8: "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
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0xcca9: "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
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}
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// Service listens and dials all configured unconnected devices, via supported
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// dialers. Successful connections are handed to the model.
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type Service struct {
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*suture.Supervisor
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cfg *config.Wrapper
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myID protocol.DeviceID
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model Model
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tlsCfg *tls.Config
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discoverer discover.Finder
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conns chan internalConn
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bepProtocolName string
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tlsDefaultCommonName string
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limiter *limiter
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natService *nat.Service
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natServiceToken *suture.ServiceToken
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listenersMut sync.RWMutex
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listeners map[string]genericListener
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listenerTokens map[string]suture.ServiceToken
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listenerSupervisor *suture.Supervisor
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}
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func NewService(cfg *config.Wrapper, myID protocol.DeviceID, mdl Model, tlsCfg *tls.Config, discoverer discover.Finder,
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bepProtocolName string, tlsDefaultCommonName string) *Service {
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service := &Service{
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Supervisor: suture.New("connections.Service", suture.Spec{
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Log: func(line string) {
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l.Infoln(line)
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},
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PanicPanics: true,
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}),
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cfg: cfg,
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myID: myID,
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model: mdl,
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tlsCfg: tlsCfg,
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discoverer: discoverer,
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conns: make(chan internalConn),
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bepProtocolName: bepProtocolName,
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tlsDefaultCommonName: tlsDefaultCommonName,
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limiter: newLimiter(cfg),
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natService: nat.NewService(myID, cfg),
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listenersMut: sync.NewRWMutex(),
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listeners: make(map[string]genericListener),
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listenerTokens: make(map[string]suture.ServiceToken),
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// A listener can fail twice, rapidly. Any more than that and it
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// will be put on suspension for ten minutes. Restarts and changes
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// due to config are done by removing and adding services, so are
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// not subject to these limitations.
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listenerSupervisor: suture.New("c.S.listenerSupervisor", suture.Spec{
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Log: func(line string) {
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l.Infoln(line)
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},
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FailureThreshold: 2,
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FailureBackoff: 600 * time.Second,
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PanicPanics: true,
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}),
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}
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cfg.Subscribe(service)
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raw := cfg.RawCopy()
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// Actually starts the listeners and NAT service
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// Need to start this before service.connect so that any dials that
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// try punch through already have a listener to cling on.
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service.CommitConfiguration(raw, raw)
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// There are several moving parts here; one routine per listening address
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// (handled in configuration changing) to handle incoming connections,
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// one routine to periodically attempt outgoing connections, one routine to
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// the common handling regardless of whether the connection was
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// incoming or outgoing.
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service.Add(serviceFunc(service.connect))
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service.Add(serviceFunc(service.handle))
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service.Add(service.listenerSupervisor)
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return service
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}
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func (s *Service) handle() {
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next:
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for c := range s.conns {
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cs := c.ConnectionState()
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// We should have negotiated the next level protocol "bep/1.0" as part
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// of the TLS handshake. Unfortunately this can't be a hard error,
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// because there are implementations out there that don't support
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// protocol negotiation (iOS for one...).
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if !cs.NegotiatedProtocolIsMutual || cs.NegotiatedProtocol != s.bepProtocolName {
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l.Infof("Peer at %s did not negotiate bep/1.0", c)
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}
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// We should have received exactly one certificate from the other
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// side. If we didn't, they don't have a device ID and we drop the
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// connection.
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certs := cs.PeerCertificates
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if cl := len(certs); cl != 1 {
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l.Infof("Got peer certificate list of length %d != 1 from peer at %s; protocol error", cl, c)
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c.Close()
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continue
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}
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remoteCert := certs[0]
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remoteID := protocol.NewDeviceID(remoteCert.Raw)
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// The device ID should not be that of ourselves. It can happen
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// though, especially in the presence of NAT hairpinning, multiple
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// clients between the same NAT gateway, and global discovery.
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if remoteID == s.myID {
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l.Infof("Connected to myself (%s) at %s - should not happen", remoteID, c)
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c.Close()
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continue
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}
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c.SetDeadline(time.Now().Add(20 * time.Second))
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hello, err := protocol.ExchangeHello(c, s.model.GetHello(remoteID))
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if err != nil {
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if protocol.IsVersionMismatch(err) {
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// The error will be a relatively user friendly description
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// of what's wrong with the version compatibility. By
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// default identify the other side by device ID and IP.
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remote := fmt.Sprintf("%v (%v)", remoteID, c.RemoteAddr())
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if hello.DeviceName != "" {
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// If the name was set in the hello return, use that to
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// give the user more info about which device is the
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// affected one. It probably says more than the remote
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// IP.
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remote = fmt.Sprintf("%q (%s %s, %v)", hello.DeviceName, hello.ClientName, hello.ClientVersion, remoteID)
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}
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msg := fmt.Sprintf("Connecting to %s: %s", remote, err)
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warningFor(remoteID, msg)
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} else {
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// It's something else - connection reset or whatever
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l.Infof("Failed to exchange Hello messages with %s at %s: %s", remoteID, c, err)
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}
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c.Close()
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continue
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}
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c.SetDeadline(time.Time{})
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// The Model will return an error for devices that we don't want to
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// have a connection with for whatever reason, for example unknown devices.
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if err := s.model.OnHello(remoteID, c.RemoteAddr(), hello); err != nil {
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l.Infof("Connection from %s at %s (%s) rejected: %v", remoteID, c.RemoteAddr(), c.Type(), err)
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c.Close()
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continue
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}
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// If we have a relay connection, and the new incoming connection is
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// not a relay connection, we should drop that, and prefer this one.
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ct, connected := s.model.Connection(remoteID)
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// Lower priority is better, just like nice etc.
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if connected && ct.Priority() > c.priority {
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l.Debugf("Switching connections %s (existing: %s new: %s)", remoteID, ct, c)
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} else if connected {
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// We should not already be connected to the other party. TODO: This
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// could use some better handling. If the old connection is dead but
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// hasn't timed out yet we may want to drop *that* connection and keep
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// this one. But in case we are two devices connecting to each other
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// in parallel we don't want to do that or we end up with no
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// connections still established...
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l.Infof("Connected to already connected device %s (existing: %s new: %s)", remoteID, ct, c)
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c.Close()
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continue
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}
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deviceCfg, ok := s.cfg.Device(remoteID)
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if !ok {
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panic("bug: unknown device should already have been rejected")
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}
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// Verify the name on the certificate. By default we set it to
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// "syncthing" when generating, but the user may have replaced
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// the certificate and used another name.
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certName := deviceCfg.CertName
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if certName == "" {
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certName = s.tlsDefaultCommonName
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}
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if err := remoteCert.VerifyHostname(certName); err != nil {
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// Incorrect certificate name is something the user most
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// likely wants to know about, since it's an advanced
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// config. Warn instead of Info.
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l.Warnf("Bad certificate from %s at %s: %v", remoteID, c, err)
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c.Close()
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continue next
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}
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// Wrap the connection in rate limiters. The limiter itself will
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// keep up with config changes to the rate and whether or not LAN
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// connections are limited.
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isLAN := s.isLAN(c.RemoteAddr())
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rd, wr := s.limiter.getLimiters(remoteID, c, isLAN)
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protoConn := protocol.NewConnection(remoteID, rd, wr, s.model, c.String(), deviceCfg.Compression)
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modelConn := completeConn{c, protoConn}
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l.Infof("Established secure connection to %s at %s (%s)", remoteID, c, tlsCipherSuiteNames[c.ConnectionState().CipherSuite])
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s.model.AddConnection(modelConn, hello)
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continue next
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}
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}
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func (s *Service) connect() {
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nextDial := make(map[string]time.Time)
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// Used as delay for the first few connection attempts, increases
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// exponentially
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initialRampup := time.Second
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// Calculated from actual dialers reconnectInterval
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var sleep time.Duration
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for {
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cfg := s.cfg.RawCopy()
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bestDialerPrio := 1<<31 - 1 // worse prio won't build on 32 bit
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for _, df := range dialers {
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if df.Valid(cfg) != nil {
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continue
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}
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if prio := df.Priority(); prio < bestDialerPrio {
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bestDialerPrio = prio
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}
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}
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l.Debugln("Reconnect loop")
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now := time.Now()
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var seen []string
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for _, deviceCfg := range cfg.Devices {
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deviceID := deviceCfg.DeviceID
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if deviceID == s.myID {
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continue
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}
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if deviceCfg.Paused {
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continue
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}
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ct, connected := s.model.Connection(deviceID)
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if connected && ct.Priority() == bestDialerPrio {
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// Things are already as good as they can get.
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continue
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}
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var addrs []string
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for _, addr := range deviceCfg.Addresses {
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if addr == "dynamic" {
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if s.discoverer != nil {
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if t, err := s.discoverer.Lookup(deviceID); err == nil {
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addrs = append(addrs, t...)
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}
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}
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} else {
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addrs = append(addrs, addr)
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}
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}
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addrs = util.UniqueStrings(addrs)
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l.Debugln("Reconnect loop for", deviceID, addrs)
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dialTargets := make([]dialTarget, 0)
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for _, addr := range addrs {
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// Use a special key that is more than just the address, as you might have two devices connected to the same relay
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nextDialKey := deviceID.String() + "/" + addr
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seen = append(seen, nextDialKey)
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nextDialAt, ok := nextDial[nextDialKey]
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if ok && initialRampup >= sleep && nextDialAt.After(now) {
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l.Debugf("Not dialing %s via %v as sleep is %v, next dial is at %s and current time is %s", deviceID, addr, sleep, nextDialAt, now)
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continue
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}
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// If we fail at any step before actually getting the dialer
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// retry in a minute
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nextDial[nextDialKey] = now.Add(time.Minute)
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uri, err := url.Parse(addr)
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if err != nil {
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l.Infof("Parsing dialer address %s: %v", addr, err)
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continue
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}
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if len(deviceCfg.AllowedNetworks) > 0 {
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if !IsAllowedNetwork(uri.Host, deviceCfg.AllowedNetworks) {
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l.Debugln("Network for", uri, "is disallowed")
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continue
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}
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}
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dialerFactory, err := getDialerFactory(cfg, uri)
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switch err {
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case nil:
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// all good
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case errDisabled:
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l.Debugln("Dialer for", uri, "is disabled")
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continue
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case errDeprecated:
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l.Debugln("Dialer for", uri, "is deprecated")
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continue
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default:
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l.Infof("Dialer for %v: %v", uri, err)
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continue
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}
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priority := dialerFactory.Priority()
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if connected && priority >= ct.Priority() {
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l.Debugf("Not dialing using %s as priority is less than current connection (%d >= %d)", dialerFactory, dialerFactory.Priority(), ct.Priority())
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continue
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}
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dialer := dialerFactory.New(s.cfg, s.tlsCfg)
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nextDial[nextDialKey] = now.Add(dialer.RedialFrequency())
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// For LAN addresses, increase the priority so that we
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// try these first.
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switch {
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case dialerFactory.AlwaysWAN():
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// Do nothing.
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case s.isLANHost(uri.Host):
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priority -= 1
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}
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dialTargets = append(dialTargets, dialTarget{
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dialer: dialer,
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priority: priority,
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deviceID: deviceID,
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uri: uri,
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})
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}
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conn, ok := dialParallel(deviceCfg.DeviceID, dialTargets)
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if ok {
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s.conns <- conn
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}
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}
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nextDial, sleep = filterAndFindSleepDuration(nextDial, seen, now)
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if initialRampup < sleep {
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l.Debugln("initial rampup; sleep", initialRampup, "and update to", initialRampup*2)
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time.Sleep(initialRampup)
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initialRampup *= 2
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} else {
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l.Debugln("sleep until next dial", sleep)
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time.Sleep(sleep)
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}
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}
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}
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func (s *Service) isLANHost(host string) bool {
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// Probably we are called with an ip:port combo which we can resolve as
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// a TCP address.
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if addr, err := net.ResolveTCPAddr("tcp", host); err == nil {
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return s.isLAN(addr)
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}
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// ... but this function looks general enough that someone might try
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// with just an IP as well in the future so lets allow that.
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if addr, err := net.ResolveIPAddr("ip", host); err == nil {
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return s.isLAN(addr)
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}
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return false
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}
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func (s *Service) isLAN(addr net.Addr) bool {
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var ip net.IP
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switch addr := addr.(type) {
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case *net.IPAddr:
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ip = addr.IP
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case *net.TCPAddr:
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ip = addr.IP
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case *net.UDPAddr:
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ip = addr.IP
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default:
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// From the standard library, just Unix sockets.
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// If you invent your own, handle it.
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return false
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}
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if ip.IsLoopback() {
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return true
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}
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for _, lan := range s.cfg.Options().AlwaysLocalNets {
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_, ipnet, err := net.ParseCIDR(lan)
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if err != nil {
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l.Debugln("Network", lan, "is malformed:", err)
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continue
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}
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if ipnet.Contains(ip) {
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return true
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}
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}
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lans, _ := osutil.GetLans()
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for _, lan := range lans {
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if lan.Contains(ip) {
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return true
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}
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}
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return false
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}
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func (s *Service) createListener(factory listenerFactory, uri *url.URL) bool {
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// must be called with listenerMut held
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l.Debugln("Starting listener", uri)
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listener := factory.New(uri, s.cfg, s.tlsCfg, s.conns, s.natService)
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listener.OnAddressesChanged(s.logListenAddressesChangedEvent)
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s.listeners[uri.String()] = listener
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s.listenerTokens[uri.String()] = s.listenerSupervisor.Add(listener)
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return true
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}
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func (s *Service) logListenAddressesChangedEvent(l genericListener) {
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events.Default.Log(events.ListenAddressesChanged, map[string]interface{}{
|
|
"address": l.URI(),
|
|
"lan": l.LANAddresses(),
|
|
"wan": l.WANAddresses(),
|
|
})
|
|
}
|
|
|
|
func (s *Service) VerifyConfiguration(from, to config.Configuration) error {
|
|
return nil
|
|
}
|
|
|
|
func (s *Service) CommitConfiguration(from, to config.Configuration) bool {
|
|
newDevices := make(map[protocol.DeviceID]bool, len(to.Devices))
|
|
for _, dev := range to.Devices {
|
|
newDevices[dev.DeviceID] = true
|
|
}
|
|
|
|
for _, dev := range from.Devices {
|
|
if !newDevices[dev.DeviceID] {
|
|
warningLimitersMut.Lock()
|
|
delete(warningLimiters, dev.DeviceID)
|
|
warningLimitersMut.Unlock()
|
|
}
|
|
}
|
|
|
|
s.listenersMut.Lock()
|
|
seen := make(map[string]struct{})
|
|
for _, addr := range config.Wrap("", to).ListenAddresses() {
|
|
if addr == "" {
|
|
// We can get an empty address if there is an empty listener
|
|
// element in the config, indicating no listeners should be
|
|
// used. This is not an error.
|
|
continue
|
|
}
|
|
|
|
if _, ok := s.listeners[addr]; ok {
|
|
seen[addr] = struct{}{}
|
|
continue
|
|
}
|
|
|
|
uri, err := url.Parse(addr)
|
|
if err != nil {
|
|
l.Infof("Parsing listener address %s: %v", addr, err)
|
|
continue
|
|
}
|
|
|
|
factory, err := getListenerFactory(to, uri)
|
|
switch err {
|
|
case nil:
|
|
// all good
|
|
case errDisabled:
|
|
l.Debugln("Listener for", uri, "is disabled")
|
|
continue
|
|
case errDeprecated:
|
|
l.Debugln("Listener for", uri, "is deprecated")
|
|
continue
|
|
default:
|
|
l.Infof("Listener for %v: %v", uri, err)
|
|
continue
|
|
}
|
|
|
|
s.createListener(factory, uri)
|
|
seen[addr] = struct{}{}
|
|
}
|
|
|
|
for addr, listener := range s.listeners {
|
|
if _, ok := seen[addr]; !ok || listener.Factory().Valid(to) != nil {
|
|
l.Debugln("Stopping listener", addr)
|
|
s.listenerSupervisor.Remove(s.listenerTokens[addr])
|
|
delete(s.listenerTokens, addr)
|
|
delete(s.listeners, addr)
|
|
}
|
|
}
|
|
s.listenersMut.Unlock()
|
|
|
|
if to.Options.NATEnabled && s.natServiceToken == nil {
|
|
l.Debugln("Starting NAT service")
|
|
token := s.Add(s.natService)
|
|
s.natServiceToken = &token
|
|
} else if !to.Options.NATEnabled && s.natServiceToken != nil {
|
|
l.Debugln("Stopping NAT service")
|
|
s.Remove(*s.natServiceToken)
|
|
s.natServiceToken = nil
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (s *Service) AllAddresses() []string {
|
|
s.listenersMut.RLock()
|
|
var addrs []string
|
|
for _, listener := range s.listeners {
|
|
for _, lanAddr := range listener.LANAddresses() {
|
|
addrs = append(addrs, lanAddr.String())
|
|
}
|
|
for _, wanAddr := range listener.WANAddresses() {
|
|
addrs = append(addrs, wanAddr.String())
|
|
}
|
|
}
|
|
s.listenersMut.RUnlock()
|
|
return util.UniqueStrings(addrs)
|
|
}
|
|
|
|
func (s *Service) ExternalAddresses() []string {
|
|
s.listenersMut.RLock()
|
|
var addrs []string
|
|
for _, listener := range s.listeners {
|
|
for _, wanAddr := range listener.WANAddresses() {
|
|
addrs = append(addrs, wanAddr.String())
|
|
}
|
|
}
|
|
s.listenersMut.RUnlock()
|
|
return util.UniqueStrings(addrs)
|
|
}
|
|
|
|
func (s *Service) Status() map[string]interface{} {
|
|
s.listenersMut.RLock()
|
|
result := make(map[string]interface{})
|
|
for addr, listener := range s.listeners {
|
|
status := make(map[string]interface{})
|
|
|
|
err := listener.Error()
|
|
if err != nil {
|
|
status["error"] = err.Error()
|
|
}
|
|
|
|
status["lanAddresses"] = urlsToStrings(listener.LANAddresses())
|
|
status["wanAddresses"] = urlsToStrings(listener.WANAddresses())
|
|
|
|
result[addr] = status
|
|
}
|
|
s.listenersMut.RUnlock()
|
|
return result
|
|
}
|
|
|
|
func (s *Service) NATType() string {
|
|
s.listenersMut.RLock()
|
|
defer s.listenersMut.RUnlock()
|
|
for _, listener := range s.listeners {
|
|
natType := listener.NATType()
|
|
if natType != "unknown" {
|
|
return natType
|
|
}
|
|
}
|
|
return "unknown"
|
|
}
|
|
|
|
func getDialerFactory(cfg config.Configuration, uri *url.URL) (dialerFactory, error) {
|
|
dialerFactory, ok := dialers[uri.Scheme]
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown address scheme %q", uri.Scheme)
|
|
}
|
|
if err := dialerFactory.Valid(cfg); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return dialerFactory, nil
|
|
}
|
|
|
|
func getListenerFactory(cfg config.Configuration, uri *url.URL) (listenerFactory, error) {
|
|
listenerFactory, ok := listeners[uri.Scheme]
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown address scheme %q", uri.Scheme)
|
|
}
|
|
if err := listenerFactory.Valid(cfg); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return listenerFactory, nil
|
|
}
|
|
|
|
func filterAndFindSleepDuration(nextDial map[string]time.Time, seen []string, now time.Time) (map[string]time.Time, time.Duration) {
|
|
newNextDial := make(map[string]time.Time)
|
|
|
|
for _, addr := range seen {
|
|
nextDialAt, ok := nextDial[addr]
|
|
if ok {
|
|
newNextDial[addr] = nextDialAt
|
|
}
|
|
}
|
|
|
|
min := time.Minute
|
|
for _, next := range newNextDial {
|
|
cur := next.Sub(now)
|
|
if cur < min {
|
|
min = cur
|
|
}
|
|
}
|
|
return newNextDial, min
|
|
}
|
|
|
|
func urlsToStrings(urls []*url.URL) []string {
|
|
strings := make([]string, len(urls))
|
|
for i, url := range urls {
|
|
strings[i] = url.String()
|
|
}
|
|
return strings
|
|
}
|
|
|
|
var warningLimiters = make(map[protocol.DeviceID]*rate.Limiter)
|
|
var warningLimitersMut = sync.NewMutex()
|
|
|
|
func warningFor(dev protocol.DeviceID, msg string) {
|
|
warningLimitersMut.Lock()
|
|
defer warningLimitersMut.Unlock()
|
|
lim, ok := warningLimiters[dev]
|
|
if !ok {
|
|
lim = rate.NewLimiter(rate.Every(perDeviceWarningIntv), 1)
|
|
warningLimiters[dev] = lim
|
|
}
|
|
if lim.Allow() {
|
|
l.Warnln(msg)
|
|
}
|
|
}
|
|
|
|
func tlsTimedHandshake(tc *tls.Conn) error {
|
|
tc.SetDeadline(time.Now().Add(tlsHandshakeTimeout))
|
|
defer tc.SetDeadline(time.Time{})
|
|
return tc.Handshake()
|
|
}
|
|
|
|
// IsAllowedNetwork returns true if the given host (IP or resolvable
|
|
// hostname) is in the set of allowed networks (CIDR format only).
|
|
func IsAllowedNetwork(host string, allowed []string) bool {
|
|
if hostNoPort, _, err := net.SplitHostPort(host); err == nil {
|
|
host = hostNoPort
|
|
}
|
|
|
|
addr, err := net.ResolveIPAddr("ip", host)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
|
|
for _, n := range allowed {
|
|
result := true
|
|
if strings.HasPrefix(n, "!") {
|
|
result = false
|
|
n = n[1:]
|
|
}
|
|
_, cidr, err := net.ParseCIDR(n)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if cidr.Contains(addr.IP) {
|
|
return result
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func dialParallel(deviceID protocol.DeviceID, dialTargets []dialTarget) (internalConn, bool) {
|
|
// Group targets into buckets by priority
|
|
dialTargetBuckets := make(map[int][]dialTarget, len(dialTargets))
|
|
for _, tgt := range dialTargets {
|
|
dialTargetBuckets[tgt.priority] = append(dialTargetBuckets[tgt.priority], tgt)
|
|
}
|
|
|
|
// Get all available priorities
|
|
priorities := make([]int, 0, len(dialTargetBuckets))
|
|
for prio := range dialTargetBuckets {
|
|
priorities = append(priorities, prio)
|
|
}
|
|
|
|
// Sort the priorities so that we dial lowest first (which means highest...)
|
|
sort.Ints(priorities)
|
|
|
|
for _, prio := range priorities {
|
|
tgts := dialTargetBuckets[prio]
|
|
res := make(chan internalConn, len(tgts))
|
|
wg := stdsync.WaitGroup{}
|
|
for _, tgt := range tgts {
|
|
wg.Add(1)
|
|
go func(tgt dialTarget) {
|
|
conn, err := tgt.Dial()
|
|
if err == nil {
|
|
res <- conn
|
|
}
|
|
wg.Done()
|
|
}(tgt)
|
|
}
|
|
|
|
// Spawn a routine which will unblock main routine in case we fail
|
|
// to connect to anyone.
|
|
go func() {
|
|
wg.Wait()
|
|
close(res)
|
|
}()
|
|
|
|
// Wait for the first connection, or for channel closure.
|
|
if conn, ok := <-res; ok {
|
|
// Got a connection, means more might come back, hence spawn a
|
|
// routine that will do the discarding.
|
|
l.Debugln("connected to", deviceID, prio, "using", conn, conn.priority)
|
|
go func(deviceID protocol.DeviceID, prio int) {
|
|
wg.Wait()
|
|
l.Debugln("discarding", len(res), "connections while connecting to", deviceID, prio)
|
|
for conn := range res {
|
|
conn.Close()
|
|
}
|
|
}(deviceID, prio)
|
|
return conn, ok
|
|
}
|
|
// Failed to connect, report that fact.
|
|
l.Debugln("failed to connect to", deviceID, prio)
|
|
}
|
|
return internalConn{}, false
|
|
}
|