mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-04 12:47:36 +03:00
820 lines
36 KiB
Go
820 lines
36 KiB
Go
package quic
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import (
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"bytes"
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"math/rand"
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"net"
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"github.com/golang/mock/gomock"
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"github.com/lucas-clemente/quic-go/internal/ackhandler"
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"github.com/lucas-clemente/quic-go/internal/handshake"
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"github.com/lucas-clemente/quic-go/internal/mocks"
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"github.com/lucas-clemente/quic-go/internal/mocks/ackhandler"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/wire"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("Packet packer", func() {
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const maxPacketSize protocol.ByteCount = 1357
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var (
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packer *packetPacker
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framer *MockFrameSource
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ackFramer *MockAckFrameSource
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initialStream *MockCryptoStream
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handshakeStream *MockCryptoStream
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sealingManager *MockSealingManager
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sealer *mocks.MockSealer
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pnManager *mockackhandler.MockSentPacketHandler
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token []byte
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)
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checkLength := func(data []byte) {
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hdr, err := wire.ParseHeader(bytes.NewReader(data), 0)
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Expect(err).ToNot(HaveOccurred())
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r := bytes.NewReader(data)
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extHdr, err := hdr.ParseExtended(r, protocol.VersionWhatever)
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Expect(err).ToNot(HaveOccurred())
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ExpectWithOffset(0, extHdr.Length).To(BeEquivalentTo(r.Len() + int(extHdr.PacketNumberLen)))
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}
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expectAppendStreamFrames := func(frames ...wire.Frame) {
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framer.EXPECT().AppendStreamFrames(gomock.Any(), gomock.Any()).DoAndReturn(func(fs []wire.Frame, _ protocol.ByteCount) []wire.Frame {
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return append(fs, frames...)
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})
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}
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expectAppendControlFrames := func(frames ...wire.Frame) {
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framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).DoAndReturn(func(fs []wire.Frame, _ protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
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var length protocol.ByteCount
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for _, f := range frames {
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length += f.Length(packer.version)
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}
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return append(fs, frames...), length
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})
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}
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BeforeEach(func() {
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rand.Seed(GinkgoRandomSeed())
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version := protocol.VersionTLS
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mockSender := NewMockStreamSender(mockCtrl)
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mockSender.EXPECT().onHasStreamData(gomock.Any()).AnyTimes()
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initialStream = NewMockCryptoStream(mockCtrl)
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handshakeStream = NewMockCryptoStream(mockCtrl)
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framer = NewMockFrameSource(mockCtrl)
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ackFramer = NewMockAckFrameSource(mockCtrl)
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sealingManager = NewMockSealingManager(mockCtrl)
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pnManager = mockackhandler.NewMockSentPacketHandler(mockCtrl)
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sealer = mocks.NewMockSealer(mockCtrl)
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sealer.EXPECT().Overhead().Return(7).AnyTimes()
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sealer.EXPECT().Seal(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).DoAndReturn(func(dst, src []byte, pn protocol.PacketNumber, associatedData []byte) []byte {
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return append(src, bytes.Repeat([]byte{0}, 7)...)
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}).AnyTimes()
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token = []byte("initial token")
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packer = newPacketPacker(
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protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
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protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
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initialStream,
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handshakeStream,
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pnManager,
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&net.TCPAddr{},
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token, // token
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sealingManager,
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framer,
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ackFramer,
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protocol.PerspectiveServer,
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version,
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)
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packer.hasSentPacket = true
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packer.version = version
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packer.maxPacketSize = maxPacketSize
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})
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Context("determining the maximum packet size", func() {
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It("uses the minimum initial size, if it can't determine if the remote address is IPv4 or IPv6", func() {
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Expect(getMaxPacketSize(&net.TCPAddr{})).To(BeEquivalentTo(protocol.MinInitialPacketSize))
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})
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It("uses the maximum IPv4 packet size, if the remote address is IPv4", func() {
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addr := &net.UDPAddr{IP: net.IPv4(11, 12, 13, 14), Port: 1337}
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Expect(getMaxPacketSize(addr)).To(BeEquivalentTo(protocol.MaxPacketSizeIPv4))
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})
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It("uses the maximum IPv6 packet size, if the remote address is IPv6", func() {
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ip := net.ParseIP("2001:0db8:85a3:0000:0000:8a2e:0370:7334")
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addr := &net.UDPAddr{IP: ip, Port: 1337}
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Expect(getMaxPacketSize(addr)).To(BeEquivalentTo(protocol.MaxPacketSizeIPv6))
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})
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})
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Context("generating a packet header", func() {
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It("uses the Long Header format", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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h := packer.getHeader(protocol.EncryptionHandshake)
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Expect(h.IsLongHeader).To(BeTrue())
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0x42)))
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Expect(h.PacketNumberLen).To(Equal(protocol.PacketNumberLen2))
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Expect(h.Version).To(Equal(packer.version))
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})
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It("sets source and destination connection ID", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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srcConnID := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
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destConnID := protocol.ConnectionID{8, 7, 6, 5, 4, 3, 2, 1}
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packer.srcConnID = srcConnID
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packer.destConnID = destConnID
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h := packer.getHeader(protocol.EncryptionHandshake)
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Expect(h.SrcConnectionID).To(Equal(srcConnID))
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Expect(h.DestConnectionID).To(Equal(destConnID))
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})
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It("changes the destination connection ID", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
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srcConnID := protocol.ConnectionID{1, 1, 1, 1, 1, 1, 1, 1}
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packer.srcConnID = srcConnID
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dest1 := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
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dest2 := protocol.ConnectionID{8, 7, 6, 5, 4, 3, 2, 1}
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packer.ChangeDestConnectionID(dest1)
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h := packer.getHeader(protocol.EncryptionInitial)
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Expect(h.SrcConnectionID).To(Equal(srcConnID))
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Expect(h.DestConnectionID).To(Equal(dest1))
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packer.ChangeDestConnectionID(dest2)
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h = packer.getHeader(protocol.EncryptionInitial)
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Expect(h.SrcConnectionID).To(Equal(srcConnID))
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Expect(h.DestConnectionID).To(Equal(dest2))
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})
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It("uses the Short Header format for 1-RTT packets", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x1337), protocol.PacketNumberLen4)
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h := packer.getHeader(protocol.Encryption1RTT)
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Expect(h.IsLongHeader).To(BeFalse())
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0x1337)))
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Expect(h.PacketNumberLen).To(Equal(protocol.PacketNumberLen4))
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})
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})
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Context("packing normal packets", func() {
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BeforeEach(func() {
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initialStream.EXPECT().HasData().AnyTimes()
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handshakeStream.EXPECT().HasData().AnyTimes()
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})
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It("returns nil when no packet is queued", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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// don't expect any calls to PopPacketNumber
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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framer.EXPECT().AppendControlFrames(nil, gomock.Any())
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framer.EXPECT().AppendStreamFrames(nil, gomock.Any())
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p, err := packer.PackPacket()
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Expect(p).To(BeNil())
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Expect(err).ToNot(HaveOccurred())
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})
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It("packs single packets", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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expectAppendControlFrames()
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f := &wire.StreamFrame{
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StreamID: 5,
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Data: []byte{0xde, 0xca, 0xfb, 0xad},
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}
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expectAppendStreamFrames(f)
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p, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p).ToNot(BeNil())
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b := &bytes.Buffer{}
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f.Write(b, packer.version)
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Expect(p.frames).To(Equal([]wire.Frame{f}))
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Expect(p.raw).To(ContainSubstring(b.String()))
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})
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It("stores the encryption level a packet was sealed with", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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expectAppendControlFrames()
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expectAppendStreamFrames(&wire.StreamFrame{
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StreamID: 5,
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Data: []byte("foobar"),
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})
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p, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p.encryptionLevel).To(Equal(protocol.Encryption1RTT))
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})
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It("packs a single ACK", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Largest: 42, Smallest: 1}}}
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ackFramer.EXPECT().GetAckFrame().Return(ack)
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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expectAppendControlFrames()
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expectAppendStreamFrames()
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p, err := packer.PackPacket()
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Expect(err).NotTo(HaveOccurred())
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Expect(p).ToNot(BeNil())
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Expect(p.frames[0]).To(Equal(ack))
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})
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It("packs a CONNECTION_CLOSE", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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// expect no framer.PopStreamFrames
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ccf := wire.ConnectionCloseFrame{
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ErrorCode: 0x1337,
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ReasonPhrase: "foobar",
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}
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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p, err := packer.PackConnectionClose(&ccf)
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(HaveLen(1))
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Expect(p.frames[0]).To(Equal(&ccf))
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})
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It("packs control frames", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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frames := []wire.Frame{&wire.ResetStreamFrame{}, &wire.MaxDataFrame{}}
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expectAppendControlFrames(frames...)
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expectAppendStreamFrames()
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p, err := packer.PackPacket()
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Expect(p).ToNot(BeNil())
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(Equal(frames))
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Expect(p.raw).NotTo(BeEmpty())
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})
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It("accounts for the space consumed by control frames", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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var maxSize protocol.ByteCount
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gomock.InOrder(
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framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).DoAndReturn(func(fs []wire.Frame, maxLen protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
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maxSize = maxLen
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return fs, 444
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}),
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framer.EXPECT().AppendStreamFrames(gomock.Any(), gomock.Any()).Do(func(_ []wire.Frame, maxLen protocol.ByteCount) []wire.Frame {
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Expect(maxLen).To(Equal(maxSize - 444 + 1 /* data length of the STREAM frame */))
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return nil
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}),
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)
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_, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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})
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Context("packing ACK packets", func() {
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It("doesn't pack a packet if there's no ACK to send", func() {
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ackFramer.EXPECT().GetAckFrame()
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p, err := packer.MaybePackAckPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p).To(BeNil())
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})
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It("packs ACK packets", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 1, Largest: 10}}}
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ackFramer.EXPECT().GetAckFrame().Return(ack)
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p, err := packer.MaybePackAckPacket()
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Expect(err).NotTo(HaveOccurred())
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Expect(p.frames).To(Equal([]wire.Frame{ack}))
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})
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})
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Context("making ACK packets retransmittable", func() {
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sendMaxNumNonRetransmittableAcks := func() {
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for i := 0; i < protocol.MaxNonRetransmittableAcks; i++ {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame().Return(&wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}}})
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expectAppendControlFrames()
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expectAppendStreamFrames()
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p, err := packer.PackPacket()
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Expect(p).ToNot(BeNil())
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(HaveLen(1))
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}
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}
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It("adds a PING frame when it's supposed to send a retransmittable packet", func() {
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sendMaxNumNonRetransmittableAcks()
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame().Return(&wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}}})
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expectAppendControlFrames()
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expectAppendStreamFrames()
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p, err := packer.PackPacket()
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Expect(p).ToNot(BeNil())
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(ContainElement(&wire.PingFrame{}))
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// make sure the next packet doesn't contain another PING
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame().Return(&wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}}})
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expectAppendControlFrames()
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expectAppendStreamFrames()
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p, err = packer.PackPacket()
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Expect(p).ToNot(BeNil())
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(HaveLen(1))
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})
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It("waits until there's something to send before adding a PING frame", func() {
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sendMaxNumNonRetransmittableAcks()
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// nothing to send
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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expectAppendControlFrames()
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expectAppendStreamFrames()
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ackFramer.EXPECT().GetAckFrame()
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p, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p).To(BeNil())
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// now add some frame to send
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expectAppendControlFrames()
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expectAppendStreamFrames()
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame().Return(&wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}}})
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p, err = packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(HaveLen(2))
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Expect(p.frames).To(ContainElement(&wire.PingFrame{}))
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})
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It("doesn't send a PING if it already sent another retransmittable frame", func() {
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sendMaxNumNonRetransmittableAcks()
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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ackFramer.EXPECT().GetAckFrame()
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expectAppendStreamFrames()
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expectAppendControlFrames(&wire.MaxDataFrame{})
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p, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p).ToNot(BeNil())
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Expect(p.frames).ToNot(ContainElement(&wire.PingFrame{}))
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})
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})
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Context("STREAM frame handling", func() {
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It("does not split a STREAM frame with maximum size", func() {
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pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
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pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
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ackFramer.EXPECT().GetAckFrame()
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sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
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expectAppendControlFrames()
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sf := &wire.StreamFrame{
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Offset: 1,
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StreamID: 5,
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DataLenPresent: true,
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}
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framer.EXPECT().AppendStreamFrames(gomock.Any(), gomock.Any()).DoAndReturn(func(_ []wire.Frame, maxSize protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
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sf.Data = bytes.Repeat([]byte{'f'}, int(maxSize-sf.Length(packer.version)))
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return []wire.Frame{sf}, sf.Length(packer.version)
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})
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p, err := packer.PackPacket()
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Expect(err).ToNot(HaveOccurred())
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Expect(p.frames).To(HaveLen(1))
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Expect(p.raw).To(HaveLen(int(maxPacketSize)))
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Expect(p.frames[0].(*wire.StreamFrame).Data).To(HaveLen(len(sf.Data)))
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Expect(p.frames[0].(*wire.StreamFrame).DataLenPresent).To(BeFalse())
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})
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It("packs multiple small STREAM frames into single packet", func() {
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f1 := &wire.StreamFrame{
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StreamID: 5,
|
|
Data: []byte("frame 1"),
|
|
DataLenPresent: true,
|
|
}
|
|
f2 := &wire.StreamFrame{
|
|
StreamID: 5,
|
|
Data: []byte("frame 2"),
|
|
DataLenPresent: true,
|
|
}
|
|
f3 := &wire.StreamFrame{
|
|
StreamID: 3,
|
|
Data: []byte("frame 3"),
|
|
DataLenPresent: true,
|
|
}
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer)
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
expectAppendControlFrames()
|
|
expectAppendStreamFrames(f1, f2, f3)
|
|
p, err := packer.PackPacket()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(p.frames).To(HaveLen(3))
|
|
Expect(p.frames[0].(*wire.StreamFrame).Data).To(Equal([]byte("frame 1")))
|
|
Expect(p.frames[0].(*wire.StreamFrame).DataLenPresent).To(BeTrue())
|
|
Expect(p.frames[1].(*wire.StreamFrame).Data).To(Equal([]byte("frame 2")))
|
|
Expect(p.frames[1].(*wire.StreamFrame).DataLenPresent).To(BeTrue())
|
|
Expect(p.frames[2].(*wire.StreamFrame).Data).To(Equal([]byte("frame 3")))
|
|
Expect(p.frames[2].(*wire.StreamFrame).DataLenPresent).To(BeFalse())
|
|
})
|
|
|
|
It("doesn't send unencrypted stream data on a data stream", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
sealingManager.EXPECT().GetSealer().Return(protocol.EncryptionInitial, sealer)
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
expectAppendControlFrames()
|
|
// don't expect a call to framer.PopStreamFrames
|
|
p, err := packer.PackPacket()
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(p).To(BeNil())
|
|
})
|
|
})
|
|
|
|
Context("retransmissions", func() {
|
|
It("retransmits a small packet", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil)
|
|
frames := []wire.Frame{
|
|
&wire.MaxDataFrame{ByteOffset: 0x1234},
|
|
&wire.StreamFrame{StreamID: 42, Data: []byte("foobar")},
|
|
}
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: frames,
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packets).To(HaveLen(1))
|
|
p := packets[0]
|
|
Expect(p.encryptionLevel).To(Equal(protocol.Encryption1RTT))
|
|
Expect(p.frames).To(Equal(frames))
|
|
})
|
|
|
|
It("packs two packets for retransmission if the original packet contained many control frames", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42)).Times(2)
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil)
|
|
var frames []wire.Frame
|
|
var totalLen protocol.ByteCount
|
|
// pack a bunch of control frames, such that the packet is way bigger than a single packet
|
|
for i := 0; totalLen < maxPacketSize*3/2; i++ {
|
|
f := &wire.MaxStreamDataFrame{
|
|
StreamID: protocol.StreamID(i),
|
|
ByteOffset: protocol.ByteCount(i),
|
|
}
|
|
frames = append(frames, f)
|
|
totalLen += f.Length(packer.version)
|
|
}
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: frames,
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packets).To(HaveLen(2))
|
|
Expect(len(packets[0].frames) + len(packets[1].frames)).To(Equal(len(frames)))
|
|
Expect(packets[1].frames).To(Equal(frames[len(packets[0].frames):]))
|
|
// check that the first packet was filled up as far as possible:
|
|
// if the first frame (after the STOP_WAITING) was packed into the first packet, it would have overflown the MaxPacketSize
|
|
Expect(len(packets[0].raw) + int(packets[1].frames[1].Length(packer.version))).To(BeNumerically(">", maxPacketSize))
|
|
})
|
|
|
|
It("splits a STREAM frame that doesn't fit", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42)).Times(2)
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil)
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: []wire.Frame{&wire.StreamFrame{
|
|
StreamID: 42,
|
|
Offset: 1337,
|
|
Data: bytes.Repeat([]byte{'a'}, int(maxPacketSize)*3/2),
|
|
}},
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packets).To(HaveLen(2))
|
|
Expect(packets[0].frames[0]).To(BeAssignableToTypeOf(&wire.StreamFrame{}))
|
|
Expect(packets[1].frames[0]).To(BeAssignableToTypeOf(&wire.StreamFrame{}))
|
|
sf1 := packets[0].frames[0].(*wire.StreamFrame)
|
|
sf2 := packets[1].frames[0].(*wire.StreamFrame)
|
|
Expect(sf1.StreamID).To(Equal(protocol.StreamID(42)))
|
|
Expect(sf1.Offset).To(Equal(protocol.ByteCount(1337)))
|
|
Expect(sf1.DataLenPresent).To(BeFalse())
|
|
Expect(sf2.StreamID).To(Equal(protocol.StreamID(42)))
|
|
Expect(sf2.Offset).To(Equal(protocol.ByteCount(1337) + sf1.DataLen()))
|
|
Expect(sf2.DataLenPresent).To(BeFalse())
|
|
Expect(sf1.DataLen() + sf2.DataLen()).To(Equal(maxPacketSize * 3 / 2))
|
|
Expect(packets[0].raw).To(HaveLen(int(maxPacketSize)))
|
|
})
|
|
|
|
It("splits STREAM frames, if necessary", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).AnyTimes()
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42)).AnyTimes()
|
|
for i := 0; i < 100; i++ {
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil).MaxTimes(2)
|
|
sf1 := &wire.StreamFrame{
|
|
StreamID: 42,
|
|
Offset: 1337,
|
|
Data: bytes.Repeat([]byte{'a'}, 1+int(rand.Int31n(int32(maxPacketSize*4/5)))),
|
|
}
|
|
sf2 := &wire.StreamFrame{
|
|
StreamID: 2,
|
|
Offset: 42,
|
|
Data: bytes.Repeat([]byte{'b'}, 1+int(rand.Int31n(int32(maxPacketSize*4/5)))),
|
|
}
|
|
expectedDataLen := sf1.DataLen() + sf2.DataLen()
|
|
frames := []wire.Frame{sf1, sf2}
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: frames,
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
|
|
if len(packets) > 1 {
|
|
Expect(packets[0].raw).To(HaveLen(int(maxPacketSize)))
|
|
}
|
|
|
|
var dataLen protocol.ByteCount
|
|
for _, p := range packets {
|
|
for _, f := range p.frames {
|
|
dataLen += f.(*wire.StreamFrame).DataLen()
|
|
}
|
|
}
|
|
Expect(dataLen).To(Equal(expectedDataLen))
|
|
}
|
|
})
|
|
|
|
It("packs two packets for retransmission if the original packet contained many STREAM frames", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42)).Times(2)
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil)
|
|
var frames []wire.Frame
|
|
var totalLen protocol.ByteCount
|
|
// pack a bunch of control frames, such that the packet is way bigger than a single packet
|
|
for i := 0; totalLen < maxPacketSize*3/2; i++ {
|
|
f := &wire.StreamFrame{
|
|
StreamID: protocol.StreamID(i),
|
|
Data: []byte("foobar"),
|
|
DataLenPresent: true,
|
|
}
|
|
frames = append(frames, f)
|
|
totalLen += f.Length(packer.version)
|
|
}
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: frames,
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packets).To(HaveLen(2))
|
|
Expect(len(packets[0].frames) + len(packets[1].frames)).To(Equal(len(frames))) // all frames
|
|
Expect(packets[1].frames).To(Equal(frames[len(packets[0].frames):]))
|
|
// check that the first packet was filled up as far as possible:
|
|
// if the first frame was packed into the first packet, it would have overflown the MaxPacketSize
|
|
Expect(len(packets[0].raw) + int(packets[1].frames[1].Length(packer.version))).To(BeNumerically(">", maxPacketSize-protocol.MinStreamFrameSize))
|
|
})
|
|
|
|
It("correctly sets the DataLenPresent on STREAM frames", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.Encryption1RTT).Return(sealer, nil)
|
|
frames := []wire.Frame{
|
|
&wire.StreamFrame{StreamID: 4, Data: []byte("foobar"), DataLenPresent: true},
|
|
&wire.StreamFrame{StreamID: 5, Data: []byte("barfoo")},
|
|
}
|
|
packets, err := packer.PackRetransmission(&ackhandler.Packet{
|
|
EncryptionLevel: protocol.Encryption1RTT,
|
|
Frames: frames,
|
|
})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packets).To(HaveLen(1))
|
|
p := packets[0]
|
|
Expect(p.frames).To(HaveLen(2))
|
|
Expect(p.frames[0]).To(BeAssignableToTypeOf(&wire.StreamFrame{}))
|
|
Expect(p.frames[1]).To(BeAssignableToTypeOf(&wire.StreamFrame{}))
|
|
sf1 := p.frames[0].(*wire.StreamFrame)
|
|
sf2 := p.frames[1].(*wire.StreamFrame)
|
|
Expect(sf1.StreamID).To(Equal(protocol.StreamID(4)))
|
|
Expect(sf1.DataLenPresent).To(BeTrue())
|
|
Expect(sf2.StreamID).To(Equal(protocol.StreamID(5)))
|
|
Expect(sf2.DataLenPresent).To(BeFalse())
|
|
})
|
|
})
|
|
|
|
Context("max packet size", func() {
|
|
It("sets the maximum packet size", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
|
|
sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer).Times(2)
|
|
ackFramer.EXPECT().GetAckFrame().Times(2)
|
|
var initialMaxPacketSize protocol.ByteCount
|
|
framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).Do(func(_ []wire.Frame, maxLen protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
|
|
initialMaxPacketSize = maxLen
|
|
return nil, 0
|
|
})
|
|
expectAppendStreamFrames()
|
|
_, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
// now reduce the maxPacketSize
|
|
packer.HandleTransportParameters(&handshake.TransportParameters{
|
|
MaxPacketSize: maxPacketSize - 10,
|
|
})
|
|
framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).Do(func(_ []wire.Frame, maxLen protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
|
|
Expect(maxLen).To(Equal(initialMaxPacketSize - 10))
|
|
return nil, 0
|
|
})
|
|
expectAppendStreamFrames()
|
|
_, err = packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
})
|
|
|
|
It("doesn't increase the max packet size", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2).Times(2)
|
|
sealingManager.EXPECT().GetSealer().Return(protocol.Encryption1RTT, sealer).Times(2)
|
|
ackFramer.EXPECT().GetAckFrame().Times(2)
|
|
var initialMaxPacketSize protocol.ByteCount
|
|
framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).Do(func(_ []wire.Frame, maxLen protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
|
|
initialMaxPacketSize = maxLen
|
|
return nil, 0
|
|
})
|
|
expectAppendStreamFrames()
|
|
_, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
// now try to increase the maxPacketSize
|
|
packer.HandleTransportParameters(&handshake.TransportParameters{
|
|
MaxPacketSize: maxPacketSize + 10,
|
|
})
|
|
framer.EXPECT().AppendControlFrames(gomock.Any(), gomock.Any()).Do(func(_ []wire.Frame, maxLen protocol.ByteCount) ([]wire.Frame, protocol.ByteCount) {
|
|
Expect(maxLen).To(Equal(initialMaxPacketSize))
|
|
return nil, 0
|
|
})
|
|
expectAppendStreamFrames()
|
|
_, err = packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("packing crypto packets", func() {
|
|
It("sets the length", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
f := &wire.CryptoFrame{
|
|
Offset: 0x1337,
|
|
Data: []byte("foobar"),
|
|
}
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
initialStream.EXPECT().HasData().Return(true)
|
|
initialStream.EXPECT().PopCryptoFrame(gomock.Any()).Return(f)
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
p, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
checkLength(p.raw)
|
|
})
|
|
|
|
It("packs a maximum size crypto packet", func() {
|
|
var f *wire.CryptoFrame
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionHandshake).Return(sealer, nil)
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
initialStream.EXPECT().HasData()
|
|
handshakeStream.EXPECT().HasData().Return(true)
|
|
handshakeStream.EXPECT().PopCryptoFrame(gomock.Any()).DoAndReturn(func(size protocol.ByteCount) *wire.CryptoFrame {
|
|
f = &wire.CryptoFrame{Offset: 0x1337}
|
|
f.Data = bytes.Repeat([]byte{'f'}, int(size-f.Length(packer.version)-1))
|
|
Expect(f.Length(packer.version)).To(Equal(size))
|
|
return f
|
|
})
|
|
p, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(p.frames).To(HaveLen(1))
|
|
expectedPacketLen := packer.maxPacketSize
|
|
Expect(p.raw).To(HaveLen(int(expectedPacketLen)))
|
|
Expect(p.header.IsLongHeader).To(BeTrue())
|
|
checkLength(p.raw)
|
|
})
|
|
|
|
It("pads Initial packets to the required minimum packet size", func() {
|
|
f := &wire.CryptoFrame{Data: []byte("foobar")}
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
initialStream.EXPECT().HasData().Return(true)
|
|
initialStream.EXPECT().PopCryptoFrame(gomock.Any()).Return(f)
|
|
packer.hasSentPacket = false
|
|
packer.perspective = protocol.PerspectiveClient
|
|
packet, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packet.header.Token).To(Equal(token))
|
|
Expect(packet.raw).To(HaveLen(protocol.MinInitialPacketSize))
|
|
Expect(packet.frames).To(HaveLen(1))
|
|
cf := packet.frames[0].(*wire.CryptoFrame)
|
|
Expect(cf.Data).To(Equal([]byte("foobar")))
|
|
})
|
|
|
|
It("sets the correct length for an Initial packet", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
ackFramer.EXPECT().GetAckFrame()
|
|
initialStream.EXPECT().HasData().Return(true)
|
|
initialStream.EXPECT().PopCryptoFrame(gomock.Any()).Return(&wire.CryptoFrame{
|
|
Data: []byte("foobar"),
|
|
})
|
|
packer.hasSentPacket = false
|
|
packer.perspective = protocol.PerspectiveClient
|
|
packet, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
checkLength(packet.raw)
|
|
})
|
|
|
|
It("adds an ACK frame", func() {
|
|
f := &wire.CryptoFrame{Data: []byte("foobar")}
|
|
ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 42, Largest: 1337}}}
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
ackFramer.EXPECT().GetAckFrame().Return(ack)
|
|
initialStream.EXPECT().HasData().Return(true)
|
|
initialStream.EXPECT().PopCryptoFrame(gomock.Any()).Return(f)
|
|
packer.version = protocol.VersionTLS
|
|
packer.hasSentPacket = false
|
|
packer.perspective = protocol.PerspectiveClient
|
|
packet, err := packer.PackPacket()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(packet.header.Token).To(Equal(token))
|
|
Expect(packet.raw).To(HaveLen(protocol.MinInitialPacketSize))
|
|
Expect(packet.frames).To(HaveLen(2))
|
|
Expect(packet.frames[0]).To(Equal(ack))
|
|
})
|
|
|
|
Context("retransmitions", func() {
|
|
sf := &wire.StreamFrame{Data: []byte("foobar")}
|
|
|
|
It("packs a retransmission with the right encryption level", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
packet := &ackhandler.Packet{
|
|
PacketType: protocol.PacketTypeHandshake,
|
|
EncryptionLevel: protocol.EncryptionInitial,
|
|
Frames: []wire.Frame{sf},
|
|
}
|
|
p, err := packer.PackRetransmission(packet)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(p).To(HaveLen(1))
|
|
Expect(p[0].header.Type).To(Equal(protocol.PacketTypeHandshake))
|
|
Expect(p[0].frames).To(Equal([]wire.Frame{sf}))
|
|
Expect(p[0].encryptionLevel).To(Equal(protocol.EncryptionInitial))
|
|
})
|
|
|
|
// this should never happen, since non forward-secure packets are limited to a size smaller than MaxPacketSize, such that it is always possible to retransmit them without splitting the StreamFrame
|
|
It("refuses to send a packet larger than MaxPacketSize", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(gomock.Any()).Return(sealer, nil)
|
|
packet := &ackhandler.Packet{
|
|
EncryptionLevel: protocol.EncryptionHandshake,
|
|
Frames: []wire.Frame{
|
|
&wire.StreamFrame{
|
|
StreamID: 1,
|
|
Data: bytes.Repeat([]byte{'f'}, int(maxPacketSize)),
|
|
},
|
|
},
|
|
}
|
|
_, err := packer.PackRetransmission(packet)
|
|
Expect(err).To(HaveOccurred())
|
|
Expect(err.Error()).To(ContainSubstring("PacketPacker BUG: packet too large"))
|
|
})
|
|
|
|
It("packs a retransmission for an Initial packet", func() {
|
|
pnManager.EXPECT().PeekPacketNumber().Return(protocol.PacketNumber(0x42), protocol.PacketNumberLen2)
|
|
pnManager.EXPECT().PopPacketNumber().Return(protocol.PacketNumber(0x42))
|
|
sealingManager.EXPECT().GetSealerWithEncryptionLevel(protocol.EncryptionInitial).Return(sealer, nil)
|
|
packer.perspective = protocol.PerspectiveClient
|
|
packet := &ackhandler.Packet{
|
|
PacketType: protocol.PacketTypeInitial,
|
|
EncryptionLevel: protocol.EncryptionInitial,
|
|
Frames: []wire.Frame{sf},
|
|
}
|
|
p, err := packer.PackRetransmission(packet)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(p).To(HaveLen(1))
|
|
Expect(p[0].frames).To(Equal([]wire.Frame{sf}))
|
|
Expect(p[0].encryptionLevel).To(Equal(protocol.EncryptionInitial))
|
|
Expect(p[0].header.Type).To(Equal(protocol.PacketTypeInitial))
|
|
Expect(p[0].header.Token).To(Equal(token))
|
|
})
|
|
})
|
|
})
|
|
})
|