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session_test.go
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package quic
import (
"bytes"
"context"
"crypto/rand"
"errors"
"net"
"runtime/pprof"
"strings"
"time"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/golang/mock/gomock"
"github.com/lucas-clemente/quic-go/internal/ackhandler"
"github.com/lucas-clemente/quic-go/internal/handshake"
"github.com/lucas-clemente/quic-go/internal/mocks"
mockackhandler "github.com/lucas-clemente/quic-go/internal/mocks/ackhandler"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/qerr"
"github.com/lucas-clemente/quic-go/internal/utils"
"github.com/lucas-clemente/quic-go/internal/wire"
)
type mockConnection struct {
remoteAddr net.Addr
localAddr net.Addr
written chan []byte
}
func newMockConnection() *mockConnection {
return &mockConnection{
remoteAddr: &net.UDPAddr{},
written: make(chan []byte, 100),
}
}
func (m *mockConnection) Write(p []byte) error {
b := make([]byte, len(p))
copy(b, p)
select {
case m.written <- b:
default:
panic("mockConnection channel full")
}
return nil
}
func (m *mockConnection) Read([]byte) (int, net.Addr, error) { panic("not implemented") }
func (m *mockConnection) SetCurrentRemoteAddr(addr net.Addr) {
m.remoteAddr = addr
}
func (m *mockConnection) LocalAddr() net.Addr { return m.localAddr }
func (m *mockConnection) RemoteAddr() net.Addr { return m.remoteAddr }
func (*mockConnection) Close() error { panic("not implemented") }
func areSessionsRunning() bool {
var b bytes.Buffer
pprof.Lookup("goroutine").WriteTo(&b, 1)
return strings.Contains(b.String(), "quic-go.(*session).run")
}
var _ = Describe("Session", func() {
var (
sess *session
sessionRunner *MockSessionRunner
mconn *mockConnection
streamManager *MockStreamManager
packer *MockPacker
cryptoSetup *mocks.MockCryptoSetup
)
BeforeEach(func() {
Eventually(areSessionsRunning).Should(BeFalse())
sessionRunner = NewMockSessionRunner(mockCtrl)
mconn = newMockConnection()
var pSess Session
var err error
pSess, err = newSession(
mconn,
sessionRunner,
protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
protocol.ConnectionID{8, 7, 6, 5, 4, 3, 2, 1},
protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
populateServerConfig(&Config{}),
nil, // tls.Config
&handshake.TransportParameters{},
utils.DefaultLogger,
protocol.VersionTLS,
)
Expect(err).NotTo(HaveOccurred())
sess = pSess.(*session)
streamManager = NewMockStreamManager(mockCtrl)
sess.streamsMap = streamManager
packer = NewMockPacker(mockCtrl)
sess.packer = packer
cryptoSetup = mocks.NewMockCryptoSetup(mockCtrl)
sess.cryptoStreamHandler = cryptoSetup
})
AfterEach(func() {
Eventually(areSessionsRunning).Should(BeFalse())
})
Context("frame handling", func() {
Context("handling STREAM frames", func() {
It("passes STREAM frames to the stream", func() {
f := &wire.StreamFrame{
StreamID: 5,
Data: []byte{0xde, 0xca, 0xfb, 0xad},
}
str := NewMockReceiveStreamI(mockCtrl)
str.EXPECT().handleStreamFrame(f)
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(5)).Return(str, nil)
err := sess.handleStreamFrame(f, protocol.Encryption1RTT)
Expect(err).ToNot(HaveOccurred())
})
It("returns errors", func() {
testErr := errors.New("test err")
f := &wire.StreamFrame{
StreamID: 5,
Data: []byte{0xde, 0xca, 0xfb, 0xad},
}
str := NewMockReceiveStreamI(mockCtrl)
str.EXPECT().handleStreamFrame(f).Return(testErr)
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(5)).Return(str, nil)
err := sess.handleStreamFrame(f, protocol.Encryption1RTT)
Expect(err).To(MatchError(testErr))
})
It("ignores STREAM frames for closed streams", func() {
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(5)).Return(nil, nil) // for closed streams, the streamManager returns nil
err := sess.handleStreamFrame(&wire.StreamFrame{
StreamID: 5,
Data: []byte("foobar"),
}, protocol.Encryption1RTT)
Expect(err).ToNot(HaveOccurred())
})
It("does not accept STREAM frames in non-1RTT packets", func() {
err := sess.handleStreamFrame(&wire.StreamFrame{
StreamID: 3,
Data: []byte("foobar"),
}, protocol.EncryptionHandshake)
Expect(err).To(MatchError(qerr.Error(qerr.ProtocolViolation, "received unencrypted stream data on stream 3")))
})
})
Context("handling ACK frames", func() {
It("informs the SentPacketHandler about ACKs", func() {
f := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 2, Largest: 3}}}
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().ReceivedAck(f, protocol.PacketNumber(42), protocol.EncryptionHandshake, gomock.Any())
sess.sentPacketHandler = sph
err := sess.handleAckFrame(f, 42, protocol.EncryptionHandshake)
Expect(err).ToNot(HaveOccurred())
})
It("tells the ReceivedPacketHandler to ignore low ranges", func() {
cryptoSetup.EXPECT().Received1RTTAck()
ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 2, Largest: 3}}}
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().ReceivedAck(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any())
sph.EXPECT().GetLowestPacketNotConfirmedAcked().Return(protocol.PacketNumber(0x42))
sess.sentPacketHandler = sph
rph := mockackhandler.NewMockReceivedPacketHandler(mockCtrl)
rph.EXPECT().IgnoreBelow(protocol.PacketNumber(0x42))
sess.receivedPacketHandler = rph
Expect(sess.handleAckFrame(ack, 0, protocol.Encryption1RTT)).To(Succeed())
})
})
Context("handling RESET_STREAM frames", func() {
It("closes the streams for writing", func() {
f := &wire.ResetStreamFrame{
StreamID: 555,
ErrorCode: 42,
ByteOffset: 0x1337,
}
str := NewMockReceiveStreamI(mockCtrl)
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(555)).Return(str, nil)
str.EXPECT().handleResetStreamFrame(f)
err := sess.handleResetStreamFrame(f)
Expect(err).ToNot(HaveOccurred())
})
It("returns errors", func() {
f := &wire.ResetStreamFrame{
StreamID: 7,
ByteOffset: 0x1337,
}
testErr := errors.New("flow control violation")
str := NewMockReceiveStreamI(mockCtrl)
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(7)).Return(str, nil)
str.EXPECT().handleResetStreamFrame(f).Return(testErr)
err := sess.handleResetStreamFrame(f)
Expect(err).To(MatchError(testErr))
})
It("ignores RESET_STREAM frames for closed streams", func() {
streamManager.EXPECT().GetOrOpenReceiveStream(protocol.StreamID(3)).Return(nil, nil)
Expect(sess.handleFrame(&wire.ResetStreamFrame{
StreamID: 3,
ErrorCode: 42,
}, 0, protocol.EncryptionUnspecified)).To(Succeed())
})
})
Context("handling MAX_DATA and MAX_STREAM_DATA frames", func() {
var connFC *mocks.MockConnectionFlowController
BeforeEach(func() {
connFC = mocks.NewMockConnectionFlowController(mockCtrl)
sess.connFlowController = connFC
})
It("updates the flow control window of a stream", func() {
f := &wire.MaxStreamDataFrame{
StreamID: 12345,
ByteOffset: 0x1337,
}
str := NewMockSendStreamI(mockCtrl)
streamManager.EXPECT().GetOrOpenSendStream(protocol.StreamID(12345)).Return(str, nil)
str.EXPECT().handleMaxStreamDataFrame(f)
err := sess.handleMaxStreamDataFrame(f)
Expect(err).ToNot(HaveOccurred())
})
It("updates the flow control window of the connection", func() {
offset := protocol.ByteCount(0x800000)
connFC.EXPECT().UpdateSendWindow(offset)
sess.handleMaxDataFrame(&wire.MaxDataFrame{ByteOffset: offset})
})
It("ignores MAX_STREAM_DATA frames for a closed stream", func() {
streamManager.EXPECT().GetOrOpenSendStream(protocol.StreamID(10)).Return(nil, nil)
Expect(sess.handleFrame(&wire.MaxStreamDataFrame{
StreamID: 10,
ByteOffset: 1337,
}, 0, protocol.EncryptionUnspecified)).To(Succeed())
})
})
Context("handling MAX_STREAM_ID frames", func() {
It("passes the frame to the streamsMap", func() {
f := &wire.MaxStreamsFrame{
Type: protocol.StreamTypeUni,
MaxStreams: 10,
}
streamManager.EXPECT().HandleMaxStreamsFrame(f)
err := sess.handleMaxStreamsFrame(f)
Expect(err).ToNot(HaveOccurred())
})
It("returns errors", func() {
f := &wire.MaxStreamsFrame{MaxStreams: 10}
testErr := errors.New("test error")
streamManager.EXPECT().HandleMaxStreamsFrame(f).Return(testErr)
err := sess.handleMaxStreamsFrame(f)
Expect(err).To(MatchError(testErr))
})
})
Context("handling STOP_SENDING frames", func() {
It("passes the frame to the stream", func() {
f := &wire.StopSendingFrame{
StreamID: 5,
ErrorCode: 10,
}
str := NewMockSendStreamI(mockCtrl)
streamManager.EXPECT().GetOrOpenSendStream(protocol.StreamID(5)).Return(str, nil)
str.EXPECT().handleStopSendingFrame(f)
err := sess.handleStopSendingFrame(f)
Expect(err).ToNot(HaveOccurred())
})
It("ignores STOP_SENDING frames for a closed stream", func() {
streamManager.EXPECT().GetOrOpenSendStream(protocol.StreamID(3)).Return(nil, nil)
Expect(sess.handleFrame(&wire.StopSendingFrame{
StreamID: 3,
ErrorCode: 1337,
}, 0, protocol.EncryptionUnspecified)).To(Succeed())
})
})
It("handles PING frames", func() {
err := sess.handleFrame(&wire.PingFrame{}, 0, protocol.EncryptionUnspecified)
Expect(err).NotTo(HaveOccurred())
})
It("rejects PATH_RESPONSE frames", func() {
err := sess.handleFrame(&wire.PathResponseFrame{Data: [8]byte{1, 2, 3, 4, 5, 6, 7, 8}}, 0, protocol.EncryptionUnspecified)
Expect(err).To(MatchError("unexpected PATH_RESPONSE frame"))
})
It("handles PATH_CHALLENGE frames", func() {
data := [8]byte{1, 2, 3, 4, 5, 6, 7, 8}
err := sess.handleFrame(&wire.PathChallengeFrame{Data: data}, 0, protocol.EncryptionUnspecified)
Expect(err).ToNot(HaveOccurred())
frames, _ := sess.framer.AppendControlFrames(nil, 1000)
Expect(frames).To(Equal([]wire.Frame{&wire.PathResponseFrame{Data: data}}))
})
It("handles BLOCKED frames", func() {
err := sess.handleFrame(&wire.DataBlockedFrame{}, 0, protocol.EncryptionUnspecified)
Expect(err).NotTo(HaveOccurred())
})
It("handles STREAM_BLOCKED frames", func() {
err := sess.handleFrame(&wire.StreamDataBlockedFrame{}, 0, protocol.EncryptionUnspecified)
Expect(err).NotTo(HaveOccurred())
})
It("handles STREAM_ID_BLOCKED frames", func() {
err := sess.handleFrame(&wire.StreamsBlockedFrame{}, 0, protocol.EncryptionUnspecified)
Expect(err).NotTo(HaveOccurred())
})
It("handles CONNECTION_CLOSE frames, with a transport error code", func() {
testErr := qerr.Error(qerr.StreamLimitError, "foobar")
streamManager.EXPECT().CloseWithError(testErr)
sessionRunner.EXPECT().Remove(gomock.Any())
cryptoSetup.EXPECT().Close()
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
Expect(sess.run()).To(MatchError(testErr))
}()
ccf := &wire.ConnectionCloseFrame{
ErrorCode: qerr.StreamLimitError,
ReasonPhrase: "foobar",
}
Expect(sess.handleFrame(ccf, 0, protocol.EncryptionUnspecified)).To(Succeed())
Eventually(sess.Context().Done()).Should(BeClosed())
})
It("handles CONNECTION_CLOSE frames, with an application error code", func() {
testErr := qerr.ApplicationError(0x1337, "foobar")
streamManager.EXPECT().CloseWithError(testErr)
sessionRunner.EXPECT().Remove(gomock.Any())
cryptoSetup.EXPECT().Close()
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
Expect(sess.run()).To(MatchError(testErr))
}()
ccf := &wire.ConnectionCloseFrame{
ErrorCode: 0x1337,
ReasonPhrase: "foobar",
IsApplicationError: true,
}
Expect(sess.handleFrame(ccf, 0, protocol.EncryptionUnspecified)).To(Succeed())
Eventually(sess.Context().Done()).Should(BeClosed())
})
})
It("tells its versions", func() {
sess.version = 4242
Expect(sess.GetVersion()).To(Equal(protocol.VersionNumber(4242)))
})
It("accepts new streams", func() {
mstr := NewMockStreamI(mockCtrl)
streamManager.EXPECT().AcceptStream().Return(mstr, nil)
str, err := sess.AcceptStream()
Expect(err).ToNot(HaveOccurred())
Expect(str).To(Equal(mstr))
})
Context("closing", func() {
var (
runErr error
expectedRunErr error
)
BeforeEach(func() {
Eventually(areSessionsRunning).Should(BeFalse())
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
runErr = sess.run()
}()
Eventually(areSessionsRunning).Should(BeTrue())
expectedRunErr = nil
})
AfterEach(func() {
if expectedRunErr != nil {
Expect(runErr).To(MatchError(expectedRunErr))
}
})
It("shuts down without error", func() {
streamManager.EXPECT().CloseWithError(qerr.Error(qerr.NoError, ""))
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{raw: []byte("connection close")}, nil)
Expect(sess.Close()).To(Succeed())
Eventually(areSessionsRunning).Should(BeFalse())
Expect(mconn.written).To(HaveLen(1))
Expect(mconn.written).To(Receive(ContainSubstring("connection close")))
Expect(sess.Context().Done()).To(BeClosed())
})
It("only closes once", func() {
streamManager.EXPECT().CloseWithError(qerr.Error(qerr.NoError, ""))
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
Expect(sess.Close()).To(Succeed())
Expect(sess.Close()).To(Succeed())
Eventually(areSessionsRunning).Should(BeFalse())
Expect(mconn.written).To(HaveLen(1))
Expect(sess.Context().Done()).To(BeClosed())
})
It("closes streams with proper error", func() {
testErr := errors.New("test error")
streamManager.EXPECT().CloseWithError(qerr.Error(0x1337, testErr.Error()))
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
sess.CloseWithError(0x1337, testErr.Error())
Eventually(areSessionsRunning).Should(BeFalse())
Expect(sess.Context().Done()).To(BeClosed())
})
It("closes the session in order to recreate it", func() {
streamManager.EXPECT().CloseWithError(gomock.Any())
sessionRunner.EXPECT().Remove(gomock.Any())
cryptoSetup.EXPECT().Close()
sess.closeForRecreating()
Expect(mconn.written).To(BeEmpty()) // no CONNECTION_CLOSE or PUBLIC_RESET sent
Eventually(areSessionsRunning).Should(BeFalse())
expectedRunErr = errCloseForRecreating
})
It("destroys the session", func() {
testErr := errors.New("close")
streamManager.EXPECT().CloseWithError(gomock.Any())
sessionRunner.EXPECT().Remove(gomock.Any())
cryptoSetup.EXPECT().Close()
sess.destroy(testErr)
Eventually(areSessionsRunning).Should(BeFalse())
Expect(mconn.written).To(BeEmpty()) // no CONNECTION_CLOSE or PUBLIC_RESET sent
expectedRunErr = testErr
})
It("cancels the context when the run loop exists", func() {
streamManager.EXPECT().CloseWithError(gomock.Any())
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
returned := make(chan struct{})
go func() {
defer GinkgoRecover()
ctx := sess.Context()
<-ctx.Done()
Expect(ctx.Err()).To(MatchError(context.Canceled))
close(returned)
}()
Consistently(returned).ShouldNot(BeClosed())
sess.Close()
Eventually(returned).Should(BeClosed())
})
It("retransmits the CONNECTION_CLOSE packet if packets are arriving late", func() {
streamManager.EXPECT().CloseWithError(gomock.Any())
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{raw: []byte("foobar")}, nil)
sess.Close()
Expect(mconn.written).To(Receive(Equal([]byte("foobar")))) // receive the CONNECTION_CLOSE
Eventually(sess.Context().Done()).Should(BeClosed())
for i := 1; i <= 20; i++ {
sess.handlePacket(&receivedPacket{})
if i == 1 || i == 2 || i == 4 || i == 8 || i == 16 {
Expect(mconn.written).To(Receive(Equal([]byte("foobar")))) // receive the CONNECTION_CLOSE
} else {
Expect(mconn.written).To(HaveLen(0))
}
}
})
})
Context("receiving packets", func() {
var unpacker *MockUnpacker
BeforeEach(func() {
unpacker = NewMockUnpacker(mockCtrl)
sess.unpacker = unpacker
})
getPacket := func(extHdr *wire.ExtendedHeader, data []byte) *receivedPacket {
buf := &bytes.Buffer{}
Expect(extHdr.Write(buf, sess.version)).To(Succeed())
return &receivedPacket{
data: append(buf.Bytes(), data...),
buffer: getPacketBuffer(),
}
}
It("drops Retry packets", func() {
hdr := wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeRetry,
}
Expect(sess.handlePacketImpl(getPacket(&wire.ExtendedHeader{Header: hdr}, nil))).To(BeFalse())
})
It("informs the ReceivedPacketHandler about non-ack-eliciting packets", func() {
hdr := &wire.ExtendedHeader{
Header: wire.Header{DestConnectionID: sess.srcConnID},
PacketNumber: 0x37,
PacketNumberLen: protocol.PacketNumberLen1,
}
rcvTime := time.Now().Add(-10 * time.Second)
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(&unpackedPacket{
packetNumber: 0x1337,
encryptionLevel: protocol.EncryptionInitial,
hdr: hdr,
data: []byte{0}, // one PADDING frame
}, nil)
rph := mockackhandler.NewMockReceivedPacketHandler(mockCtrl)
rph.EXPECT().ReceivedPacket(protocol.PacketNumber(0x1337), protocol.EncryptionInitial, rcvTime, false)
sess.receivedPacketHandler = rph
packet := getPacket(hdr, nil)
packet.rcvTime = rcvTime
Expect(sess.handlePacketImpl(packet)).To(BeTrue())
})
It("informs the ReceivedPacketHandler about ack-eliciting packets", func() {
hdr := &wire.ExtendedHeader{
Header: wire.Header{DestConnectionID: sess.srcConnID},
PacketNumber: 0x37,
PacketNumberLen: protocol.PacketNumberLen1,
}
rcvTime := time.Now().Add(-10 * time.Second)
buf := &bytes.Buffer{}
Expect((&wire.PingFrame{}).Write(buf, sess.version)).To(Succeed())
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(&unpackedPacket{
packetNumber: 0x1337,
encryptionLevel: protocol.EncryptionHandshake,
hdr: hdr,
data: buf.Bytes(),
}, nil)
rph := mockackhandler.NewMockReceivedPacketHandler(mockCtrl)
rph.EXPECT().ReceivedPacket(protocol.PacketNumber(0x1337), protocol.EncryptionHandshake, rcvTime, true)
sess.receivedPacketHandler = rph
packet := getPacket(hdr, nil)
packet.rcvTime = rcvTime
Expect(sess.handlePacketImpl(packet)).To(BeTrue())
})
It("drops a packet when unpacking fails", func() {
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(nil, errors.New("unpack error"))
streamManager.EXPECT().CloseWithError(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
sess.run()
}()
sessionRunner.EXPECT().Retire(gomock.Any())
sess.handlePacket(getPacket(&wire.ExtendedHeader{
Header: wire.Header{DestConnectionID: sess.srcConnID},
PacketNumberLen: protocol.PacketNumberLen1,
}, nil))
Consistently(sess.Context().Done()).ShouldNot(BeClosed())
// make the go routine return
sess.closeLocal(errors.New("close"))
Eventually(sess.Context().Done()).Should(BeClosed())
})
It("rejects packets with empty payload", func() {
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(&unpackedPacket{
hdr: &wire.ExtendedHeader{},
data: []byte{}, // no payload
}, nil)
streamManager.EXPECT().CloseWithError(gomock.Any())
cryptoSetup.EXPECT().Close()
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
err := sess.run()
Expect(err).To(MatchError("PROTOCOL_VIOLATION: empty packet"))
close(done)
}()
sessionRunner.EXPECT().Retire(gomock.Any())
sess.handlePacket(getPacket(&wire.ExtendedHeader{
Header: wire.Header{DestConnectionID: sess.srcConnID},
PacketNumberLen: protocol.PacketNumberLen1,
}, nil))
Eventually(done).Should(BeClosed())
})
It("ignores 0-RTT packets", func() {
hdr := &wire.ExtendedHeader{
Header: wire.Header{
IsLongHeader: true,
Type: protocol.PacketType0RTT,
DestConnectionID: sess.srcConnID,
},
PacketNumberLen: protocol.PacketNumberLen2,
}
Expect(sess.handlePacketImpl(getPacket(hdr, nil))).To(BeFalse())
})
It("ignores packets with a different source connection ID", func() {
hdr1 := &wire.ExtendedHeader{
Header: wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeHandshake,
DestConnectionID: sess.destConnID,
SrcConnectionID: sess.srcConnID,
Length: 1,
Version: sess.version,
},
PacketNumberLen: protocol.PacketNumberLen1,
PacketNumber: 1,
}
hdr2 := &wire.ExtendedHeader{
Header: wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeHandshake,
DestConnectionID: sess.destConnID,
SrcConnectionID: protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef},
Length: 1,
Version: sess.version,
},
PacketNumberLen: protocol.PacketNumberLen1,
PacketNumber: 2,
}
Expect(sess.srcConnID).ToNot(Equal(hdr2.SrcConnectionID))
// Send one packet, which might change the connection ID.
// only EXPECT one call to the unpacker
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(&unpackedPacket{
encryptionLevel: protocol.Encryption1RTT,
hdr: hdr1,
data: []byte{0}, // one PADDING frame
}, nil)
Expect(sess.handlePacketImpl(getPacket(hdr1, nil))).To(BeTrue())
// The next packet has to be ignored, since the source connection ID doesn't match.
Expect(sess.handlePacketImpl(getPacket(hdr2, nil))).To(BeFalse())
})
It("queues undecryptable packets", func() {
hdr := &wire.ExtendedHeader{
Header: wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeHandshake,
DestConnectionID: sess.destConnID,
SrcConnectionID: sess.srcConnID,
Length: 1,
Version: sess.version,
},
PacketNumberLen: protocol.PacketNumberLen1,
PacketNumber: 1,
}
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(nil, handshake.ErrOpenerNotYetAvailable)
packet := getPacket(hdr, nil)
Expect(sess.handlePacketImpl(packet)).To(BeFalse())
Expect(sess.undecryptablePackets).To(Equal([]*receivedPacket{packet}))
})
Context("updating the remote address", func() {
It("doesn't support connection migration", func() {
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(&unpackedPacket{
encryptionLevel: protocol.Encryption1RTT,
hdr: &wire.ExtendedHeader{},
data: []byte{0}, // one PADDING frame
}, nil)
origAddr := sess.conn.(*mockConnection).remoteAddr
remoteIP := &net.IPAddr{IP: net.IPv4(192, 168, 0, 100)}
Expect(origAddr).ToNot(Equal(remoteIP))
packet := getPacket(&wire.ExtendedHeader{
Header: wire.Header{DestConnectionID: sess.srcConnID},
PacketNumberLen: protocol.PacketNumberLen1,
}, nil)
packet.remoteAddr = remoteIP
Expect(sess.handlePacketImpl(packet)).To(BeTrue())
Expect(sess.conn.(*mockConnection).remoteAddr).To(Equal(origAddr))
})
})
Context("coalesced packets", func() {
getPacketWithLength := func(connID protocol.ConnectionID, length protocol.ByteCount) (int /* header length */, *receivedPacket) {
hdr := &wire.ExtendedHeader{
Header: wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeHandshake,
DestConnectionID: connID,
SrcConnectionID: sess.destConnID,
Version: protocol.VersionTLS,
Length: length,
},
PacketNumberLen: protocol.PacketNumberLen3,
}
hdrLen := hdr.GetLength(sess.version)
b := make([]byte, 1)
rand.Read(b)
packet := getPacket(hdr, bytes.Repeat(b, int(length)-3))
return int(hdrLen), packet
}
It("cuts packets to the right length", func() {
hdrLen, packet := getPacketWithLength(sess.srcConnID, 456)
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).DoAndReturn(func(_ *wire.Header, data []byte) (*unpackedPacket, error) {
Expect(data).To(HaveLen(hdrLen + 456 - 3))
return &unpackedPacket{
encryptionLevel: protocol.EncryptionHandshake,
data: []byte{0},
}, nil
})
Expect(sess.handlePacketImpl(packet)).To(BeTrue())
})
It("handles coalesced packets", func() {
hdrLen1, packet1 := getPacketWithLength(sess.srcConnID, 456)
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).DoAndReturn(func(_ *wire.Header, data []byte) (*unpackedPacket, error) {
Expect(data).To(HaveLen(hdrLen1 + 456 - 3))
return &unpackedPacket{
encryptionLevel: protocol.EncryptionHandshake,
data: []byte{0},
}, nil
})
hdrLen2, packet2 := getPacketWithLength(sess.srcConnID, 123)
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).DoAndReturn(func(_ *wire.Header, data []byte) (*unpackedPacket, error) {
Expect(data).To(HaveLen(hdrLen2 + 123 - 3))
return &unpackedPacket{
encryptionLevel: protocol.EncryptionHandshake,
data: []byte{0},
}, nil
})
packet1.data = append(packet1.data, packet2.data...)
Expect(sess.handlePacketImpl(packet1)).To(BeTrue())
})
It("works with undecryptable packets", func() {
hdrLen1, packet1 := getPacketWithLength(sess.srcConnID, 456)
hdrLen2, packet2 := getPacketWithLength(sess.srcConnID, 123)
gomock.InOrder(
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).Return(nil, handshake.ErrOpenerNotYetAvailable),
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).DoAndReturn(func(_ *wire.Header, data []byte) (*unpackedPacket, error) {
Expect(data).To(HaveLen(hdrLen2 + 123 - 3))
return &unpackedPacket{
encryptionLevel: protocol.EncryptionHandshake,
data: []byte{0},
}, nil
}),
)
packet1.data = append(packet1.data, packet2.data...)
Expect(sess.handlePacketImpl(packet1)).To(BeTrue())
Expect(sess.undecryptablePackets).To(HaveLen(1))
Expect(sess.undecryptablePackets[0].data).To(HaveLen(hdrLen1 + 456 - 3))
})
It("ignores coalesced packet parts if the destination connection IDs don't match", func() {
wrongConnID := protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef}
Expect(sess.srcConnID).ToNot(Equal(wrongConnID))
hdrLen1, packet1 := getPacketWithLength(sess.srcConnID, 456)
unpacker.EXPECT().Unpack(gomock.Any(), gomock.Any()).DoAndReturn(func(_ *wire.Header, data []byte) (*unpackedPacket, error) {
Expect(data).To(HaveLen(hdrLen1 + 456 - 3))
return &unpackedPacket{
encryptionLevel: protocol.EncryptionHandshake,
data: []byte{0},
}, nil
})
_, packet2 := getPacketWithLength(wrongConnID, 123)
// don't EXPECT any calls to unpacker.Unpack()
packet1.data = append(packet1.data, packet2.data...)
Expect(sess.handlePacketImpl(packet1)).To(BeTrue())
})
})
})
Context("sending packets", func() {
getPacket := func(pn protocol.PacketNumber) *packedPacket {
buffer := getPacketBuffer()
data := buffer.Slice[:0]
data = append(data, []byte("foobar")...)
return &packedPacket{
raw: data,
buffer: buffer,
header: &wire.ExtendedHeader{PacketNumber: pn},
}
}
It("sends packets", func() {
packer.EXPECT().PackPacket().Return(getPacket(1), nil)
Expect(sess.receivedPacketHandler.ReceivedPacket(0x035e, protocol.Encryption1RTT, time.Now(), true)).To(Succeed())
sent, err := sess.sendPacket()
Expect(err).NotTo(HaveOccurred())
Expect(sent).To(BeTrue())
})
It("doesn't send packets if there's nothing to send", func() {
packer.EXPECT().PackPacket().Return(getPacket(2), nil)
Expect(sess.receivedPacketHandler.ReceivedPacket(0x035e, protocol.Encryption1RTT, time.Now(), true)).To(Succeed())
sent, err := sess.sendPacket()
Expect(err).NotTo(HaveOccurred())
Expect(sent).To(BeTrue())
})
It("sends ACK only packets", func() {
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().GetAlarmTimeout().AnyTimes()
sph.EXPECT().SendMode().Return(ackhandler.SendAck)
sph.EXPECT().ShouldSendNumPackets().Return(1000)
packer.EXPECT().MaybePackAckPacket()
sess.sentPacketHandler = sph
Expect(sess.sendPackets()).To(Succeed())
})
It("adds a BLOCKED frame when it is connection-level flow control blocked", func() {
fc := mocks.NewMockConnectionFlowController(mockCtrl)
fc.EXPECT().IsNewlyBlocked().Return(true, protocol.ByteCount(1337))
packer.EXPECT().PackPacket().Return(getPacket(1), nil)
sess.connFlowController = fc
sent, err := sess.sendPacket()
Expect(err).NotTo(HaveOccurred())
Expect(sent).To(BeTrue())
frames, _ := sess.framer.AppendControlFrames(nil, 1000)
Expect(frames).To(Equal([]wire.Frame{&wire.DataBlockedFrame{DataLimit: 1337}}))
})
It("sends a retransmission and a regular packet in the same run", func() {
packetToRetransmit := &ackhandler.Packet{
PacketNumber: 10,
PacketType: protocol.PacketTypeHandshake,
}
retransmittedPacket := getPacket(123)
newPacket := getPacket(234)
sess.windowUpdateQueue.callback(&wire.MaxDataFrame{})
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().DequeuePacketForRetransmission().Return(packetToRetransmit)
sph.EXPECT().SendMode().Return(ackhandler.SendRetransmission)
sph.EXPECT().SendMode().Return(ackhandler.SendAny)
sph.EXPECT().ShouldSendNumPackets().Return(2)
sph.EXPECT().TimeUntilSend()
gomock.InOrder(
packer.EXPECT().PackRetransmission(packetToRetransmit).Return([]*packedPacket{retransmittedPacket}, nil),
sph.EXPECT().SentPacketsAsRetransmission(gomock.Any(), protocol.PacketNumber(10)).Do(func(packets []*ackhandler.Packet, _ protocol.PacketNumber) {
Expect(packets).To(HaveLen(1))
Expect(packets[0].PacketNumber).To(Equal(protocol.PacketNumber(123)))
}),
packer.EXPECT().PackPacket().Return(newPacket, nil),
sph.EXPECT().SentPacket(gomock.Any()).Do(func(p *ackhandler.Packet) {
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(234)))
}),
)
sess.sentPacketHandler = sph
Expect(sess.sendPackets()).To(Succeed())
})
It("sends multiple packets, if the retransmission is split", func() {
packet := &ackhandler.Packet{
PacketNumber: 42,
Frames: []wire.Frame{&wire.StreamFrame{
StreamID: 0x5,
Data: []byte("foobar"),
}},
EncryptionLevel: protocol.Encryption1RTT,
}
retransmissions := []*packedPacket{getPacket(1337), getPacket(1338)}
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().DequeuePacketForRetransmission().Return(packet)
packer.EXPECT().PackRetransmission(packet).Return(retransmissions, nil)
sph.EXPECT().SentPacketsAsRetransmission(gomock.Any(), protocol.PacketNumber(42)).Do(func(packets []*ackhandler.Packet, _ protocol.PacketNumber) {
Expect(packets).To(HaveLen(2))
Expect(packets[0].PacketNumber).To(Equal(protocol.PacketNumber(1337)))
Expect(packets[1].PacketNumber).To(Equal(protocol.PacketNumber(1338)))
})
sess.sentPacketHandler = sph
sent, err := sess.maybeSendRetransmission()
Expect(err).NotTo(HaveOccurred())
Expect(sent).To(BeTrue())
Expect(mconn.written).To(HaveLen(2))
})
It("sends a probe packet", func() {
packetToRetransmit := &ackhandler.Packet{
PacketNumber: 0x42,
PacketType: protocol.PacketTypeHandshake,
}
retransmittedPacket := getPacket(123)
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().TimeUntilSend()
sph.EXPECT().SendMode().Return(ackhandler.SendPTO)
sph.EXPECT().ShouldSendNumPackets().Return(1)
sph.EXPECT().DequeueProbePacket().Return(packetToRetransmit, nil)
packer.EXPECT().PackRetransmission(packetToRetransmit).Return([]*packedPacket{retransmittedPacket}, nil)
sph.EXPECT().SentPacketsAsRetransmission(gomock.Any(), protocol.PacketNumber(0x42)).Do(func(packets []*ackhandler.Packet, _ protocol.PacketNumber) {
Expect(packets).To(HaveLen(1))
Expect(packets[0].PacketNumber).To(Equal(protocol.PacketNumber(123)))
})
sess.sentPacketHandler = sph
Expect(sess.sendPackets()).To(Succeed())
})
It("doesn't send when the SentPacketHandler doesn't allow it", func() {
sph := mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().SendMode().Return(ackhandler.SendNone)
sess.sentPacketHandler = sph
err := sess.sendPackets()
Expect(err).ToNot(HaveOccurred())
})
Context("packet pacing", func() {
var sph *mockackhandler.MockSentPacketHandler
BeforeEach(func() {
sph = mockackhandler.NewMockSentPacketHandler(mockCtrl)
sph.EXPECT().GetAlarmTimeout().AnyTimes()
sph.EXPECT().DequeuePacketForRetransmission().AnyTimes()
sess.sentPacketHandler = sph
streamManager.EXPECT().CloseWithError(gomock.Any())
})
It("sends multiple packets one by one immediately", func() {
sph.EXPECT().SentPacket(gomock.Any()).Times(2)
sph.EXPECT().ShouldSendNumPackets().Return(1).Times(2)
sph.EXPECT().TimeUntilSend().Return(time.Now()).Times(2)
sph.EXPECT().TimeUntilSend().Return(time.Now().Add(time.Hour))
sph.EXPECT().SendMode().Return(ackhandler.SendAny).Times(2) // allow 2 packets...
packer.EXPECT().PackPacket().Return(getPacket(10), nil)
packer.EXPECT().PackPacket().Return(getPacket(11), nil)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
sess.run()
close(done)
}()
sess.scheduleSending()
Eventually(mconn.written).Should(HaveLen(2))
Consistently(mconn.written).Should(HaveLen(2))
// make the go routine return
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
sess.Close()
Eventually(done).Should(BeClosed())
})
// when becoming congestion limited, at some point the SendMode will change from SendAny to SendAck
// we shouldn't send the ACK in the same run
It("doesn't send an ACK right after becoming congestion limited", func() {
sph.EXPECT().SentPacket(gomock.Any())
sph.EXPECT().ShouldSendNumPackets().Return(1000)
sph.EXPECT().TimeUntilSend().Return(time.Now())
sph.EXPECT().SendMode().Return(ackhandler.SendAny)
sph.EXPECT().SendMode().Return(ackhandler.SendAck)
packer.EXPECT().PackPacket().Return(getPacket(100), nil)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
sess.run()
close(done)
}()
sess.scheduleSending()
Eventually(mconn.written).Should(HaveLen(1))
Consistently(mconn.written).Should(HaveLen(1))
// make the go routine return
packer.EXPECT().PackConnectionClose(gomock.Any()).Return(&packedPacket{}, nil)
sessionRunner.EXPECT().Retire(gomock.Any())
cryptoSetup.EXPECT().Close()
sess.Close()
Eventually(done).Should(BeClosed())
})
It("paces packets", func() {
pacingDelay := scaleDuration(100 * time.Millisecond)
sph.EXPECT().SentPacket(gomock.Any()).Times(2)
sph.EXPECT().TimeUntilSend().Return(time.Now().Add(-time.Minute)) // send one packet immediately
sph.EXPECT().TimeUntilSend().Return(time.Now().Add(pacingDelay)) // send one
sph.EXPECT().TimeUntilSend().Return(time.Now().Add(time.Hour))
sph.EXPECT().ShouldSendNumPackets().Times(2).Return(1)
sph.EXPECT().SendMode().Return(ackhandler.SendAny).AnyTimes()
packer.EXPECT().PackPacket().Return(getPacket(100), nil)
packer.EXPECT().PackPacket().Return(getPacket(101), nil)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().RunHandshake().MaxTimes(1)
sess.run()
close(done)
}()
sess.scheduleSending()