syncthing/lib/connections/quic_misc.go

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// Copyright (C) 2019 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/.
//go:build !noquic
// +build !noquic
package connections
import (
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"context"
"crypto/tls"
"net"
"net/url"
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"sync/atomic"
"time"
"github.com/quic-go/quic-go"
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"github.com/quic-go/quic-go/logging"
"github.com/syncthing/syncthing/lib/osutil"
)
var quicConfig = &quic.Config{
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MaxIdleTimeout: 30 * time.Second,
KeepAlivePeriod: 15 * time.Second,
}
func quicNetwork(uri *url.URL) string {
switch uri.Scheme {
case "quic4":
return "udp4"
case "quic6":
return "udp6"
default:
return "udp"
}
}
type quicTlsConn struct {
quic.Connection
quic.Stream
// If we created this connection, we should be the ones closing it.
createdConn net.PacketConn
}
func (q *quicTlsConn) Close() error {
sterr := q.Stream.Close()
seerr := q.Connection.CloseWithError(0, "closing")
var pcerr error
if q.createdConn != nil {
pcerr = q.createdConn.Close()
}
if sterr != nil {
return sterr
}
if seerr != nil {
return seerr
}
return pcerr
}
func (q *quicTlsConn) ConnectionState() tls.ConnectionState {
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return q.Connection.ConnectionState().TLS
}
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func transportConnUnspecified(conn any) bool {
tran, ok := conn.(*quic.Transport)
if !ok {
return false
}
addr := tran.Conn.LocalAddr()
ip, err := osutil.IPFromAddr(addr)
return err == nil && ip.IsUnspecified()
}
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type writeTrackingTracer struct {
lastWrite atomic.Int64 // unix nanos
}
func (t *writeTrackingTracer) loggingTracer() *logging.Tracer {
return &logging.Tracer{
SentPacket: func(net.Addr, *logging.Header, logging.ByteCount, []logging.Frame) {
t.lastWrite.Store(time.Now().UnixNano())
},
SentVersionNegotiationPacket: func(net.Addr, logging.ArbitraryLenConnectionID, logging.ArbitraryLenConnectionID, []logging.VersionNumber) {
t.lastWrite.Store(time.Now().UnixNano())
},
}
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}
func (t *writeTrackingTracer) LastWrite() time.Time {
return time.Unix(0, t.lastWrite.Load())
}
// A transportPacketConn is a net.PacketConn that uses a quic.Transport.
type transportPacketConn struct {
tran *quic.Transport
readDeadline atomic.Value // time.Time
}
func (t *transportPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
ctx := context.Background()
if deadline, ok := t.readDeadline.Load().(time.Time); ok && !deadline.IsZero() {
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, deadline)
defer cancel()
}
return t.tran.ReadNonQUICPacket(ctx, p)
}
func (t *transportPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
return t.tran.WriteTo(p, addr)
}
func (*transportPacketConn) Close() error {
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return errUnsupported
}
func (t *transportPacketConn) LocalAddr() net.Addr {
return t.tran.Conn.LocalAddr()
}
func (t *transportPacketConn) SetDeadline(deadline time.Time) error {
return t.SetReadDeadline(deadline)
}
func (t *transportPacketConn) SetReadDeadline(deadline time.Time) error {
t.readDeadline.Store(deadline)
return nil
}
func (*transportPacketConn) SetWriteDeadline(_ time.Time) error {
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return nil // yolo
}