cloudflared-mirror/connection/quic.go

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package connection
import (
"bufio"
"context"
"crypto/tls"
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"fmt"
"io"
"net"
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"net/http"
"net/netip"
"runtime"
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"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/quic-go/quic-go"
"github.com/rs/zerolog"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"golang.org/x/sync/errgroup"
"github.com/cloudflare/cloudflared/datagramsession"
"github.com/cloudflare/cloudflared/ingress"
"github.com/cloudflare/cloudflared/management"
"github.com/cloudflare/cloudflared/packet"
cfdquic "github.com/cloudflare/cloudflared/quic"
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"github.com/cloudflare/cloudflared/tracing"
"github.com/cloudflare/cloudflared/tunnelrpc/pogs"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
rpcquic "github.com/cloudflare/cloudflared/tunnelrpc/quic"
)
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const (
// HTTPHeaderKey is used to get or set http headers in QUIC ALPN if the underlying proxy connection type is HTTP.
HTTPHeaderKey = "HttpHeader"
// HTTPMethodKey is used to get or set http method in QUIC ALPN if the underlying proxy connection type is HTTP.
HTTPMethodKey = "HttpMethod"
// HTTPHostKey is used to get or set http Method in QUIC ALPN if the underlying proxy connection type is HTTP.
HTTPHostKey = "HttpHost"
QUICMetadataFlowID = "FlowID"
// emperically this capacity has been working well
demuxChanCapacity = 16
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)
var (
portForConnIndex = make(map[uint8]int, 0)
portMapMutex sync.Mutex
)
// QUICConnection represents the type that facilitates Proxying via QUIC streams.
type QUICConnection struct {
session quic.Connection
logger *zerolog.Logger
orchestrator Orchestrator
// sessionManager tracks active sessions. It receives datagrams from quic connection via datagramMuxer
sessionManager datagramsession.Manager
// datagramMuxer mux/demux datagrams from quic connection
datagramMuxer *cfdquic.DatagramMuxerV2
packetRouter *ingress.PacketRouter
controlStreamHandler ControlStreamHandler
connOptions *tunnelpogs.ConnectionOptions
connIndex uint8
rpcTimeout time.Duration
streamWriteTimeout time.Duration
gracePeriod time.Duration
}
// NewQUICConnection returns a new instance of QUICConnection.
func NewQUICConnection(
ctx context.Context,
quicConfig *quic.Config,
edgeAddr netip.AddrPort,
localAddr net.IP,
connIndex uint8,
tlsConfig *tls.Config,
orchestrator Orchestrator,
connOptions *tunnelpogs.ConnectionOptions,
controlStreamHandler ControlStreamHandler,
logger *zerolog.Logger,
packetRouterConfig *ingress.GlobalRouterConfig,
rpcTimeout time.Duration,
streamWriteTimeout time.Duration,
gracePeriod time.Duration,
) (*QUICConnection, error) {
udpConn, err := createUDPConnForConnIndex(connIndex, localAddr, edgeAddr, logger)
if err != nil {
return nil, err
}
session, err := quic.Dial(ctx, udpConn, net.UDPAddrFromAddrPort(edgeAddr), tlsConfig, quicConfig)
if err != nil {
// close the udp server socket in case of error connecting to the edge
udpConn.Close()
return nil, &EdgeQuicDialError{Cause: err}
}
// wrap the session, so that the UDPConn is closed after session is closed.
session = &wrapCloseableConnQuicConnection{
session,
udpConn,
}
sessionDemuxChan := make(chan *packet.Session, demuxChanCapacity)
datagramMuxer := cfdquic.NewDatagramMuxerV2(session, logger, sessionDemuxChan)
sessionManager := datagramsession.NewManager(logger, datagramMuxer.SendToSession, sessionDemuxChan)
packetRouter := ingress.NewPacketRouter(packetRouterConfig, datagramMuxer, logger)
return &QUICConnection{
session: session,
orchestrator: orchestrator,
logger: logger,
sessionManager: sessionManager,
datagramMuxer: datagramMuxer,
packetRouter: packetRouter,
controlStreamHandler: controlStreamHandler,
connOptions: connOptions,
connIndex: connIndex,
rpcTimeout: rpcTimeout,
streamWriteTimeout: streamWriteTimeout,
gracePeriod: gracePeriod,
}, nil
}
// Serve starts a QUIC session that begins accepting streams.
func (q *QUICConnection) Serve(ctx context.Context) error {
// origintunneld assumes the first stream is used for the control plane
controlStream, err := q.session.OpenStream()
if err != nil {
return fmt.Errorf("failed to open a registration control stream: %w", err)
}
// If either goroutine returns nil error, we rely on this cancellation to make sure the other goroutine exits
// as fast as possible as well. Nil error means we want to exit for good (caller code won't retry serving this
// connection).
// If either goroutine returns a non nil error, then the error group cancels the context, thus also canceling the
// other goroutine as fast as possible.
ctx, cancel := context.WithCancel(ctx)
errGroup, ctx := errgroup.WithContext(ctx)
// In the future, if cloudflared can autonomously push traffic to the edge, we have to make sure the control
// stream is already fully registered before the other goroutines can proceed.
errGroup.Go(func() error {
// err is equal to nil if we exit due to unregistration. If that happens we want to wait the full
// amount of the grace period, allowing requests to finish before we cancel the context, which will
// make cloudflared exit.
if err := q.serveControlStream(ctx, controlStream); err == nil {
select {
case <-ctx.Done():
case <-time.Tick(q.gracePeriod):
}
}
cancel()
return err
})
errGroup.Go(func() error {
defer cancel()
return q.acceptStream(ctx)
})
errGroup.Go(func() error {
defer cancel()
return q.sessionManager.Serve(ctx)
})
errGroup.Go(func() error {
defer cancel()
return q.datagramMuxer.ServeReceive(ctx)
})
errGroup.Go(func() error {
defer cancel()
return q.packetRouter.Serve(ctx)
})
return errGroup.Wait()
}
func (q *QUICConnection) serveControlStream(ctx context.Context, controlStream quic.Stream) error {
// This blocks until the control plane is done.
err := q.controlStreamHandler.ServeControlStream(ctx, controlStream, q.connOptions, q.orchestrator)
if err != nil {
// Not wrapping error here to be consistent with the http2 message.
return err
}
return nil
}
// Close closes the session with no errors specified.
func (q *QUICConnection) Close() {
q.session.CloseWithError(0, "")
}
func (q *QUICConnection) acceptStream(ctx context.Context) error {
defer q.Close()
for {
quicStream, err := q.session.AcceptStream(ctx)
if err != nil {
// context.Canceled is usually a user ctrl+c. We don't want to log an error here as it's intentional.
if errors.Is(err, context.Canceled) || q.controlStreamHandler.IsStopped() {
return nil
}
return fmt.Errorf("failed to accept QUIC stream: %w", err)
}
go q.runStream(quicStream)
}
}
func (q *QUICConnection) runStream(quicStream quic.Stream) {
ctx := quicStream.Context()
stream := cfdquic.NewSafeStreamCloser(quicStream, q.streamWriteTimeout, q.logger)
defer stream.Close()
// we are going to fuse readers/writers from stream <- cloudflared -> origin, and we want to guarantee that
// code executed in the code path of handleStream don't trigger an earlier close to the downstream write stream.
// So, we wrap the stream with a no-op write closer and only this method can actually close write side of the stream.
// A call to close will simulate a close to the read-side, which will fail subsequent reads.
noCloseStream := &nopCloserReadWriter{ReadWriteCloser: stream}
ss := rpcquic.NewCloudflaredServer(q.handleDataStream, q, q, q.rpcTimeout)
if err := ss.Serve(ctx, noCloseStream); err != nil {
q.logger.Debug().Err(err).Msg("Failed to handle QUIC stream")
// if we received an error at this level, then close write side of stream with an error, which will result in
// RST_STREAM frame.
quicStream.CancelWrite(0)
}
}
func (q *QUICConnection) handleDataStream(ctx context.Context, stream *rpcquic.RequestServerStream) error {
request, err := stream.ReadConnectRequestData()
if err != nil {
return err
}
if err, connectResponseSent := q.dispatchRequest(ctx, stream, err, request); err != nil {
q.logger.Err(err).Str("type", request.Type.String()).Str("dest", request.Dest).Msg("Request failed")
// if the connectResponse was already sent and we had an error, we need to propagate it up, so that the stream is
// closed with an RST_STREAM frame
if connectResponseSent {
return err
}
if writeRespErr := stream.WriteConnectResponseData(err); writeRespErr != nil {
return writeRespErr
}
}
return nil
}
// dispatchRequest will dispatch the request depending on the type and returns an error if it occurs.
// More importantly, it also tells if the during processing of the request the ConnectResponse metadata was sent downstream.
// This is important since it informs
func (q *QUICConnection) dispatchRequest(ctx context.Context, stream *rpcquic.RequestServerStream, err error, request *pogs.ConnectRequest) (error, bool) {
originProxy, err := q.orchestrator.GetOriginProxy()
if err != nil {
return err, false
}
switch request.Type {
case pogs.ConnectionTypeHTTP, pogs.ConnectionTypeWebsocket:
tracedReq, err := buildHTTPRequest(ctx, request, stream, q.connIndex, q.logger)
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if err != nil {
return err, false
}
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w := newHTTPResponseAdapter(stream)
return originProxy.ProxyHTTP(&w, tracedReq, request.Type == pogs.ConnectionTypeWebsocket), w.connectResponseSent
case pogs.ConnectionTypeTCP:
rwa := &streamReadWriteAcker{RequestServerStream: stream}
metadata := request.MetadataMap()
return originProxy.ProxyTCP(ctx, rwa, &TCPRequest{
Dest: request.Dest,
FlowID: metadata[QUICMetadataFlowID],
CfTraceID: metadata[tracing.TracerContextName],
ConnIndex: q.connIndex,
}), rwa.connectResponseSent
default:
return errors.Errorf("unsupported error type: %s", request.Type), false
}
}
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// RegisterUdpSession is the RPC method invoked by edge to register and run a session
func (q *QUICConnection) RegisterUdpSession(ctx context.Context, sessionID uuid.UUID, dstIP net.IP, dstPort uint16, closeAfterIdleHint time.Duration, traceContext string) (*tunnelpogs.RegisterUdpSessionResponse, error) {
traceCtx := tracing.NewTracedContext(ctx, traceContext, q.logger)
ctx, registerSpan := traceCtx.Tracer().Start(traceCtx, "register-session", trace.WithAttributes(
attribute.String("session-id", sessionID.String()),
attribute.String("dst", fmt.Sprintf("%s:%d", dstIP, dstPort)),
))
log := q.logger.With().Int(management.EventTypeKey, int(management.UDP)).Logger()
// Each session is a series of datagram from an eyeball to a dstIP:dstPort.
// (src port, dst IP, dst port) uniquely identifies a session, so it needs a dedicated connected socket.
originProxy, err := ingress.DialUDP(dstIP, dstPort)
if err != nil {
log.Err(err).Msgf("Failed to create udp proxy to %s:%d", dstIP, dstPort)
tracing.EndWithErrorStatus(registerSpan, err)
return nil, err
}
registerSpan.SetAttributes(
attribute.Bool("socket-bind-success", true),
attribute.String("src", originProxy.LocalAddr().String()),
)
session, err := q.sessionManager.RegisterSession(ctx, sessionID, originProxy)
if err != nil {
originProxy.Close()
log.Err(err).Str("sessionID", sessionID.String()).Msgf("Failed to register udp session")
tracing.EndWithErrorStatus(registerSpan, err)
return nil, err
}
go q.serveUDPSession(session, closeAfterIdleHint)
log.Debug().
Str("sessionID", sessionID.String()).
Str("src", originProxy.LocalAddr().String()).
Str("dst", fmt.Sprintf("%s:%d", dstIP, dstPort)).
Msgf("Registered session")
tracing.End(registerSpan)
resp := tunnelpogs.RegisterUdpSessionResponse{
Spans: traceCtx.GetProtoSpans(),
}
return &resp, nil
}
func (q *QUICConnection) serveUDPSession(session *datagramsession.Session, closeAfterIdleHint time.Duration) {
ctx := q.session.Context()
closedByRemote, err := session.Serve(ctx, closeAfterIdleHint)
// If session is terminated by remote, then we know it has been unregistered from session manager and edge
if !closedByRemote {
if err != nil {
q.closeUDPSession(ctx, session.ID, err.Error())
} else {
q.closeUDPSession(ctx, session.ID, "terminated without error")
}
}
q.logger.Debug().Err(err).
Int(management.EventTypeKey, int(management.UDP)).
Str("sessionID", session.ID.String()).
Msg("Session terminated")
}
// closeUDPSession first unregisters the session from session manager, then it tries to unregister from edge
func (q *QUICConnection) closeUDPSession(ctx context.Context, sessionID uuid.UUID, message string) {
q.sessionManager.UnregisterSession(ctx, sessionID, message, false)
quicStream, err := q.session.OpenStream()
if err != nil {
// Log this at debug because this is not an error if session was closed due to lost connection
// with edge
q.logger.Debug().Err(err).
Int(management.EventTypeKey, int(management.UDP)).
Str("sessionID", sessionID.String()).
Msgf("Failed to open quic stream to unregister udp session with edge")
return
}
stream := cfdquic.NewSafeStreamCloser(quicStream, q.streamWriteTimeout, q.logger)
defer stream.Close()
rpcClientStream, err := rpcquic.NewSessionClient(ctx, stream, q.rpcTimeout)
if err != nil {
// Log this at debug because this is not an error if session was closed due to lost connection
// with edge
q.logger.Err(err).Str("sessionID", sessionID.String()).
Msgf("Failed to open rpc stream to unregister udp session with edge")
return
}
defer rpcClientStream.Close()
if err := rpcClientStream.UnregisterUdpSession(ctx, sessionID, message); err != nil {
q.logger.Err(err).Str("sessionID", sessionID.String()).
Msgf("Failed to unregister udp session with edge")
}
}
// UnregisterUdpSession is the RPC method invoked by edge to unregister and terminate a sesssion
func (q *QUICConnection) UnregisterUdpSession(ctx context.Context, sessionID uuid.UUID, message string) error {
return q.sessionManager.UnregisterSession(ctx, sessionID, message, true)
}
// UpdateConfiguration is the RPC method invoked by edge when there is a new configuration
func (q *QUICConnection) UpdateConfiguration(ctx context.Context, version int32, config []byte) *tunnelpogs.UpdateConfigurationResponse {
return q.orchestrator.UpdateConfig(version, config)
}
// streamReadWriteAcker is a light wrapper over QUIC streams with a callback to send response back to
// the client.
type streamReadWriteAcker struct {
*rpcquic.RequestServerStream
connectResponseSent bool
}
// AckConnection acks response back to the proxy.
func (s *streamReadWriteAcker) AckConnection(tracePropagation string) error {
metadata := []pogs.Metadata{}
// Only add tracing if provided by origintunneld
if tracePropagation != "" {
metadata = append(metadata, pogs.Metadata{
Key: tracing.CanonicalCloudflaredTracingHeader,
Val: tracePropagation,
})
}
s.connectResponseSent = true
return s.WriteConnectResponseData(nil, metadata...)
}
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// httpResponseAdapter translates responses written by the HTTP Proxy into ones that can be used in QUIC.
type httpResponseAdapter struct {
*rpcquic.RequestServerStream
headers http.Header
connectResponseSent bool
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}
func newHTTPResponseAdapter(s *rpcquic.RequestServerStream) httpResponseAdapter {
return httpResponseAdapter{RequestServerStream: s, headers: make(http.Header)}
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}
func (hrw *httpResponseAdapter) AddTrailer(trailerName, trailerValue string) {
// we do not support trailers over QUIC
}
func (hrw *httpResponseAdapter) WriteRespHeaders(status int, header http.Header) error {
metadata := make([]pogs.Metadata, 0)
metadata = append(metadata, pogs.Metadata{Key: "HttpStatus", Val: strconv.Itoa(status)})
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for k, vv := range header {
for _, v := range vv {
httpHeaderKey := fmt.Sprintf("%s:%s", HTTPHeaderKey, k)
metadata = append(metadata, pogs.Metadata{Key: httpHeaderKey, Val: v})
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}
}
return hrw.WriteConnectResponseData(nil, metadata...)
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}
func (hrw *httpResponseAdapter) Write(p []byte) (int, error) {
// Make sure to send WriteHeader response if not called yet
if !hrw.connectResponseSent {
hrw.WriteRespHeaders(http.StatusOK, hrw.headers)
}
return hrw.RequestServerStream.Write(p)
}
func (hrw *httpResponseAdapter) Header() http.Header {
return hrw.headers
}
// This is a no-op Flush because this adapter is over a quic.Stream and we don't need Flush here.
func (hrw *httpResponseAdapter) Flush() {}
func (hrw *httpResponseAdapter) WriteHeader(status int) {
hrw.WriteRespHeaders(status, hrw.headers)
}
func (hrw *httpResponseAdapter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
conn := &localProxyConnection{hrw.ReadWriteCloser}
readWriter := bufio.NewReadWriter(
bufio.NewReader(hrw.ReadWriteCloser),
bufio.NewWriter(hrw.ReadWriteCloser),
)
return conn, readWriter, nil
}
func (hrw *httpResponseAdapter) WriteErrorResponse(err error) {
hrw.WriteConnectResponseData(err, pogs.Metadata{Key: "HttpStatus", Val: strconv.Itoa(http.StatusBadGateway)})
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}
func (hrw *httpResponseAdapter) WriteConnectResponseData(respErr error, metadata ...pogs.Metadata) error {
hrw.connectResponseSent = true
return hrw.RequestServerStream.WriteConnectResponseData(respErr, metadata...)
}
func buildHTTPRequest(
ctx context.Context,
connectRequest *pogs.ConnectRequest,
body io.ReadCloser,
connIndex uint8,
log *zerolog.Logger,
) (*tracing.TracedHTTPRequest, error) {
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metadata := connectRequest.MetadataMap()
dest := connectRequest.Dest
method := metadata[HTTPMethodKey]
host := metadata[HTTPHostKey]
isWebsocket := connectRequest.Type == pogs.ConnectionTypeWebsocket
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req, err := http.NewRequestWithContext(ctx, method, dest, body)
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if err != nil {
return nil, err
}
req.Host = host
for _, metadata := range connectRequest.Metadata {
if strings.Contains(metadata.Key, HTTPHeaderKey) {
// metadata.Key is off the format httpHeaderKey:<HTTPHeader>
httpHeaderKey := strings.Split(metadata.Key, ":")
if len(httpHeaderKey) != 2 {
return nil, fmt.Errorf("header Key: %s malformed", metadata.Key)
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}
req.Header.Add(httpHeaderKey[1], metadata.Val)
}
}
// Go's http.Client automatically sends chunked request body if this value is not set on the
// *http.Request struct regardless of header:
// https://go.googlesource.com/go/+/go1.8rc2/src/net/http/transfer.go#154.
if err := setContentLength(req); err != nil {
return nil, fmt.Errorf("Error setting content-length: %w", err)
}
// Go's client defaults to chunked encoding after a 200ms delay if the following cases are true:
// * the request body blocks
// * the content length is not set (or set to -1)
// * the method doesn't usually have a body (GET, HEAD, DELETE, ...)
// * there is no transfer-encoding=chunked already set.
// So, if transfer cannot be chunked and content length is 0, we dont set a request body.
if !isWebsocket && !isTransferEncodingChunked(req) && req.ContentLength == 0 {
req.Body = http.NoBody
}
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stripWebsocketUpgradeHeader(req)
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// Check for tracing on request
tracedReq := tracing.NewTracedHTTPRequest(req, connIndex, log)
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return tracedReq, err
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}
func setContentLength(req *http.Request) error {
var err error
if contentLengthStr := req.Header.Get("Content-Length"); contentLengthStr != "" {
req.ContentLength, err = strconv.ParseInt(contentLengthStr, 10, 64)
}
return err
}
func isTransferEncodingChunked(req *http.Request) bool {
transferEncodingVal := req.Header.Get("Transfer-Encoding")
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Transfer-Encoding suggests that this can be a comma
// separated value as well.
return strings.Contains(strings.ToLower(transferEncodingVal), "chunked")
}
// A helper struct that guarantees a call to close only affects read side, but not write side.
type nopCloserReadWriter struct {
io.ReadWriteCloser
// for use by Read only
// we don't need a memory barrier here because there is an implicit assumption that
// Read calls can't happen concurrently by different go-routines.
sawEOF bool
// should be updated and read using atomic primitives.
// value is read in Read method and written in Close method, which could be done by different
// go-routines.
closed uint32
}
func (np *nopCloserReadWriter) Read(p []byte) (n int, err error) {
if np.sawEOF {
return 0, io.EOF
}
if atomic.LoadUint32(&np.closed) > 0 {
return 0, fmt.Errorf("closed by handler")
}
n, err = np.ReadWriteCloser.Read(p)
if err == io.EOF {
np.sawEOF = true
}
return
}
func (np *nopCloserReadWriter) Close() error {
atomic.StoreUint32(&np.closed, 1)
return nil
}
// muxerWrapper wraps DatagramMuxerV2 to satisfy the packet.FunnelUniPipe interface
type muxerWrapper struct {
muxer *cfdquic.DatagramMuxerV2
}
func (rp *muxerWrapper) SendPacket(dst netip.Addr, pk packet.RawPacket) error {
return rp.muxer.SendPacket(cfdquic.RawPacket(pk))
}
func (rp *muxerWrapper) ReceivePacket(ctx context.Context) (packet.RawPacket, error) {
pk, err := rp.muxer.ReceivePacket(ctx)
if err != nil {
return packet.RawPacket{}, err
}
rawPacket, ok := pk.(cfdquic.RawPacket)
if ok {
return packet.RawPacket(rawPacket), nil
}
return packet.RawPacket{}, fmt.Errorf("unexpected packet type %+v", pk)
}
func (rp *muxerWrapper) Close() error {
return nil
}
func createUDPConnForConnIndex(connIndex uint8, localIP net.IP, edgeIP netip.AddrPort, logger *zerolog.Logger) (*net.UDPConn, error) {
portMapMutex.Lock()
defer portMapMutex.Unlock()
listenNetwork := "udp"
// https://github.com/quic-go/quic-go/issues/3793 DF bit cannot be set for dual stack listener ("udp") on macOS,
// to set the DF bit properly, the network string needs to be specific to the IP family.
if runtime.GOOS == "darwin" {
if edgeIP.Addr().Is4() {
listenNetwork = "udp4"
} else {
listenNetwork = "udp6"
}
}
// if port was not set yet, it will be zero, so bind will randomly allocate one.
if port, ok := portForConnIndex[connIndex]; ok {
udpConn, err := net.ListenUDP(listenNetwork, &net.UDPAddr{IP: localIP, Port: port})
// if there wasn't an error, or if port was 0 (independently of error or not, just return)
if err == nil {
return udpConn, nil
} else {
logger.Debug().Err(err).Msgf("Unable to reuse port %d for connIndex %d. Falling back to random allocation.", port, connIndex)
}
}
// if we reached here, then there was an error or port as not been allocated it.
udpConn, err := net.ListenUDP(listenNetwork, &net.UDPAddr{IP: localIP, Port: 0})
if err == nil {
udpAddr, ok := (udpConn.LocalAddr()).(*net.UDPAddr)
if !ok {
return nil, fmt.Errorf("unable to cast to udpConn")
}
portForConnIndex[connIndex] = udpAddr.Port
} else {
delete(portForConnIndex, connIndex)
}
return udpConn, err
}
type wrapCloseableConnQuicConnection struct {
quic.Connection
udpConn *net.UDPConn
}
func (w *wrapCloseableConnQuicConnection) CloseWithError(errorCode quic.ApplicationErrorCode, reason string) error {
err := w.Connection.CloseWithError(errorCode, reason)
w.udpConn.Close()
return err
}