mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-04 20:57:36 +03:00
539 lines
20 KiB
Go
539 lines
20 KiB
Go
package wire
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import (
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"bytes"
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"io"
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"log"
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"os"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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"github.com/lucas-clemente/quic-go/qerr"
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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("IETF QUIC Header", func() {
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srcConnID := protocol.ConnectionID(bytes.Repeat([]byte{'f'}, protocol.ConnectionIDLen))
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appendPacketNumber := func(data []byte, pn protocol.PacketNumber, pnLen protocol.PacketNumberLen) []byte {
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buf := &bytes.Buffer{}
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utils.WriteVarIntPacketNumber(buf, pn, pnLen)
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return append(data, buf.Bytes()...)
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}
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Context("parsing", func() {
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Context("Version Negotiation Packets", func() {
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It("parses", func() {
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connID := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
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versions := []protocol.VersionNumber{0x22334455, 0x33445566}
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data, err := ComposeVersionNegotiation(connID, connID, versions)
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Expect(err).ToNot(HaveOccurred())
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.IsVersionNegotiation).To(BeTrue())
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Expect(h.Version).To(BeZero())
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Expect(h.DestConnectionID).To(Equal(connID))
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Expect(h.SrcConnectionID).To(Equal(connID))
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for _, v := range versions {
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Expect(h.SupportedVersions).To(ContainElement(v))
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}
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})
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It("errors if it contains versions of the wrong length", func() {
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connID := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
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versions := []protocol.VersionNumber{0x22334455, 0x33445566}
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data, err := ComposeVersionNegotiation(connID, connID, versions)
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Expect(err).ToNot(HaveOccurred())
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b := bytes.NewReader(data[:len(data)-2])
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_, err = parseHeader(b)
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Expect(err).To(MatchError(qerr.InvalidVersionNegotiationPacket))
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})
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It("errors if the version list is empty", func() {
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connID := protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
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versions := []protocol.VersionNumber{0x22334455}
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data, err := ComposeVersionNegotiation(connID, connID, versions)
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Expect(err).ToNot(HaveOccurred())
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// remove 8 bytes (two versions), since ComposeVersionNegotiation also added a reserved version number
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_, err = parseHeader(bytes.NewReader(data[:len(data)-8]))
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Expect(err).To(MatchError("InvalidVersionNegotiationPacket: empty version list"))
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})
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})
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Context("long headers", func() {
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It("parses a long header", func() {
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data := []byte{
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0x80 ^ uint8(protocol.PacketTypeInitial),
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0x1, 0x2, 0x3, 0x4, // version number
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0x55, // connection ID lengths
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // destination connection ID
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // source connection ID
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}
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data = append(data, encodeVarInt(0x1337)...) // payload length
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// packet number
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data = appendPacketNumber(data, 0xbeef, protocol.PacketNumberLen4)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.Type).To(Equal(protocol.PacketTypeInitial))
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Expect(h.IsLongHeader).To(BeTrue())
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Expect(h.DestConnectionID).To(Equal(protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37}))
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Expect(h.SrcConnectionID).To(Equal(protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37}))
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Expect(h.PayloadLen).To(Equal(protocol.ByteCount(0x1337)))
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0xbeef)))
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Expect(h.PacketNumberLen).To(Equal(protocol.PacketNumberLen4))
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Expect(h.Version).To(Equal(protocol.VersionNumber(0x1020304)))
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Expect(h.IsVersionNegotiation).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("parses a long header without a destination connection ID", func() {
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data := []byte{
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0x80 ^ uint8(protocol.PacketTypeInitial),
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0x1, 0x2, 0x3, 0x4, // version number
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0x01, // connection ID lengths
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0xde, 0xad, 0xbe, 0xef, // source connection ID
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}
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data = append(data, encodeVarInt(0x42)...) // payload length
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data = append(data, []byte{0xde, 0xca, 0xfb, 0xad}...)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.SrcConnectionID).To(Equal(protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef}))
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Expect(h.DestConnectionID).To(BeEmpty())
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})
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It("parses a long header with a 2 byte connection ID", func() {
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data := []byte{
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0x80 ^ uint8(protocol.PacketTypeInitial),
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0x1, 0x2, 0x3, 0x4, // version number
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0x0, // connection ID lengths
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}
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data = append(data, encodeVarInt(0x42)...) // payload length
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data = appendPacketNumber(data, 0x123, protocol.PacketNumberLen2)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0x123)))
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Expect(h.PacketNumberLen).To(Equal(protocol.PacketNumberLen2))
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})
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It("parses a long header without a source connection ID", func() {
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data := []byte{
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0x80 ^ uint8(protocol.PacketTypeInitial),
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0x1, 0x2, 0x3, 0x4, // version number
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0x70, // connection ID lengths
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, // source connection ID
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}
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data = append(data, encodeVarInt(0x42)...) // payload length
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data = append(data, []byte{0xde, 0xca, 0xfb, 0xad}...)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.SrcConnectionID).To(BeEmpty())
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Expect(h.DestConnectionID).To(Equal(protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}))
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})
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It("rejects packets sent with an unknown packet type", func() {
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buf := &bytes.Buffer{}
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err := (&Header{
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IsLongHeader: true,
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Type: 42,
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SrcConnectionID: srcConnID,
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Version: 0x10203040,
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PacketNumber: 1,
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PacketNumberLen: protocol.PacketNumberLen1,
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}).Write(buf, protocol.PerspectiveClient, protocol.VersionTLS)
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Expect(err).ToNot(HaveOccurred())
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b := bytes.NewReader(buf.Bytes())
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_, err = parseHeader(b)
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Expect(err).To(MatchError("InvalidPacketHeader: Received packet with invalid packet type: 42"))
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})
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It("errors on EOF", func() {
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data := []byte{
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0x80 ^ uint8(protocol.PacketTypeInitial),
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0x1, 0x2, 0x3, 0x4, // version number
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0x55, // connection ID lengths
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // destination connection ID
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // source connection ID
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}
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data = appendPacketNumber(data, 0x1337, protocol.PacketNumberLen4)
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for i := 0; i < len(data); i++ {
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_, err := parseHeader(bytes.NewReader(data[:i]))
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Expect(err).To(Equal(io.EOF))
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}
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})
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})
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Context("short headers", func() {
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It("reads a short header with a connection ID", func() {
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data := []byte{
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0x30, // 1 byte packet number
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 0x42, protocol.PacketNumberLen1)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.IsLongHeader).To(BeFalse())
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Expect(h.KeyPhase).To(Equal(0))
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Expect(h.DestConnectionID).To(Equal(protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37}))
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Expect(h.SrcConnectionID).To(BeEmpty())
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0x42)))
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Expect(h.IsVersionNegotiation).To(BeFalse())
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Expect(b.Len()).To(BeZero())
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})
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It("reads the Key Phase Bit", func() {
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data := []byte{
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0x30 ^ 0x40,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 11, protocol.PacketNumberLen1)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.IsLongHeader).To(BeFalse())
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Expect(h.KeyPhase).To(Equal(1))
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Expect(b.Len()).To(BeZero())
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})
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It("reads a header with a 2 byte packet number", func() {
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data := []byte{
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0x30 ^ 0x40 ^ 0x1,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 0x1337, protocol.PacketNumberLen2)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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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.PacketNumberLen2))
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Expect(b.Len()).To(BeZero())
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})
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It("reads a header with a 4 byte packet number", func() {
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data := []byte{
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0x30 ^ 0x40 ^ 0x2,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 0x99beef, protocol.PacketNumberLen4)
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b := bytes.NewReader(data)
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h, err := parseHeader(b)
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Expect(err).ToNot(HaveOccurred())
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Expect(h.IsLongHeader).To(BeFalse())
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Expect(h.PacketNumber).To(Equal(protocol.PacketNumber(0x99beef)))
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Expect(h.PacketNumberLen).To(Equal(protocol.PacketNumberLen4))
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Expect(b.Len()).To(BeZero())
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})
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It("rejects headers that have bit 3,4 and 5 set incorrectly", func() {
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data := []byte{
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0x38 ^ 0x2,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 1234, protocol.PacketNumberLen2)
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b := bytes.NewReader(data)
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_, err := parseHeader(b)
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Expect(err).To(MatchError("invalid bits 3, 4 and 5"))
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})
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It("errors on EOF", func() {
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data := []byte{
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0x30 ^ 0x2,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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}
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data = appendPacketNumber(data, 1234, protocol.PacketNumberLen2)
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for i := 0; i < len(data); i++ {
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_, err := parseHeader(bytes.NewReader(data[:i]))
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Expect(err).To(Equal(io.EOF))
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}
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})
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})
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})
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Context("writing", func() {
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var buf *bytes.Buffer
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BeforeEach(func() {
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buf = &bytes.Buffer{}
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})
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Context("long header", func() {
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It("writes", func() {
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err := (&Header{
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IsLongHeader: true,
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Type: 0x5,
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DestConnectionID: protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe},
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SrcConnectionID: protocol.ConnectionID{0xde, 0xca, 0xfb, 0xad, 0x0, 0x0, 0x13, 0x37},
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PayloadLen: 0xcafe,
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PacketNumber: 0xdecaf,
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PacketNumberLen: protocol.PacketNumberLen4,
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Version: 0x1020304,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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expected := []byte{
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0x80 ^ 0x5,
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0x1, 0x2, 0x3, 0x4, // version number
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0x35, // connection ID lengths
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, // dest connection ID
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0xde, 0xca, 0xfb, 0xad, 0x0, 0x0, 0x13, 0x37, // source connection ID
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}
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expected = append(expected, encodeVarInt(0xcafe)...) // payload length
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expected = appendPacketNumber(expected, 0xdecaf, protocol.PacketNumberLen4)
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Expect(buf.Bytes()).To(Equal(expected))
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})
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It("refuses to write a header with a too short connection ID", func() {
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err := (&Header{
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IsLongHeader: true,
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Type: 0x5,
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SrcConnectionID: srcConnID,
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DestConnectionID: protocol.ConnectionID{1, 2, 3}, // connection IDs must be at least 4 bytes long
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PacketNumber: 0xdecafbad,
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PacketNumberLen: protocol.PacketNumberLen4,
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Version: 0x1020304,
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}).writeHeader(buf)
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Expect(err).To(MatchError("invalid connection ID length: 3 bytes"))
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})
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It("refuses to write a header with a too long connection ID", func() {
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err := (&Header{
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IsLongHeader: true,
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Type: 0x5,
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SrcConnectionID: srcConnID,
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DestConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19}, // connection IDs must be at most 18 bytes long
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PacketNumber: 0xdecafbad,
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PacketNumberLen: protocol.PacketNumberLen4,
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Version: 0x1020304,
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}).writeHeader(buf)
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Expect(err).To(MatchError("invalid connection ID length: 19 bytes"))
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})
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It("writes a header with an 18 byte connection ID", func() {
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err := (&Header{
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IsLongHeader: true,
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Type: 0x5,
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SrcConnectionID: srcConnID,
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DestConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, // connection IDs must be at most 18 bytes long
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PacketNumber: 0xdecafbad,
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PacketNumberLen: protocol.PacketNumberLen4,
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Version: 0x1020304,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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Expect(buf.Bytes()).To(ContainSubstring(string([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18})))
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})
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})
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Context("short header", func() {
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It("writes a header with connection ID", func() {
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err := (&Header{
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DestConnectionID: protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37},
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PacketNumberLen: protocol.PacketNumberLen1,
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PacketNumber: 0x42,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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Expect(buf.Bytes()).To(Equal([]byte{
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0x30,
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0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37, // connection ID
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0x42, // packet number
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}))
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})
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It("writes a header without connection ID", func() {
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err := (&Header{
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PacketNumberLen: protocol.PacketNumberLen1,
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PacketNumber: 0x42,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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Expect(buf.Bytes()).To(Equal([]byte{
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0x30,
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0x42, // packet number
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}))
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})
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It("writes a header with a 2 byte packet number", func() {
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err := (&Header{
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PacketNumberLen: protocol.PacketNumberLen2,
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PacketNumber: 0x765,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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expected := []byte{0x30}
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expected = appendPacketNumber(expected, 0x765, protocol.PacketNumberLen2)
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Expect(buf.Bytes()).To(Equal(expected))
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})
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It("writes a header with a 4 byte packet number", func() {
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err := (&Header{
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PacketNumberLen: protocol.PacketNumberLen4,
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PacketNumber: 0x123456,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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expected := []byte{0x30}
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expected = appendPacketNumber(expected, 0x123456, protocol.PacketNumberLen4)
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Expect(buf.Bytes()).To(Equal(expected))
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})
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It("errors when given an invalid packet number length", func() {
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err := (&Header{
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PacketNumberLen: 3,
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PacketNumber: 0xdecafbad,
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}).writeHeader(buf)
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Expect(err).To(MatchError("invalid packet number length: 3"))
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})
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It("writes the Key Phase Bit", func() {
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err := (&Header{
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KeyPhase: 1,
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PacketNumberLen: protocol.PacketNumberLen1,
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PacketNumber: 0x42,
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}).writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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Expect(buf.Bytes()).To(Equal([]byte{
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0x30 | 0x40,
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0x42, // packet number
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}))
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})
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})
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})
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Context("length", func() {
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var buf *bytes.Buffer
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BeforeEach(func() {
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buf = &bytes.Buffer{}
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})
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It("has the right length for the long header, for a short payload length", func() {
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h := &Header{
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IsLongHeader: true,
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PayloadLen: 1,
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DestConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
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SrcConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
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PacketNumberLen: protocol.PacketNumberLen1,
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}
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expectedLen := 1 /* type byte */ + 4 /* version */ + 1 /* conn ID len */ + 8 /* dest conn id */ + 8 /* src conn id */ + 1 /* short payload len */ + 1 /* packet number */
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Expect(h.getHeaderLength()).To(BeEquivalentTo(expectedLen))
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err := h.writeHeader(buf)
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Expect(err).ToNot(HaveOccurred())
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Expect(buf.Len()).To(Equal(expectedLen))
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})
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It("has the right length for the long header, for a long payload length", func() {
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h := &Header{
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IsLongHeader: true,
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PayloadLen: 1500,
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DestConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
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SrcConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
|
|
PacketNumberLen: protocol.PacketNumberLen2,
|
|
}
|
|
expectedLen := 1 /* type byte */ + 4 /* version */ + 1 /* conn ID len */ + 8 /* dest conn id */ + 8 /* src conn id */ + 2 /* long payload len */ + 2 /* packet number */
|
|
Expect(h.getHeaderLength()).To(BeEquivalentTo(expectedLen))
|
|
err := h.writeHeader(buf)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(buf.Len()).To(Equal(expectedLen))
|
|
})
|
|
|
|
It("has the right length for a hort header containing a connection ID", func() {
|
|
h := &Header{
|
|
PacketNumberLen: protocol.PacketNumberLen1,
|
|
DestConnectionID: protocol.ConnectionID{1, 2, 3, 4, 5, 6, 7, 8},
|
|
}
|
|
Expect(h.getHeaderLength()).To(Equal(protocol.ByteCount(1 + 8 + 1)))
|
|
err := h.writeHeader(buf)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(buf.Len()).To(Equal(10))
|
|
})
|
|
|
|
It("has the right length for a short header without a connection ID", func() {
|
|
h := &Header{PacketNumberLen: protocol.PacketNumberLen1}
|
|
Expect(h.getHeaderLength()).To(Equal(protocol.ByteCount(1 + 1)))
|
|
err := h.writeHeader(buf)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(buf.Len()).To(Equal(2))
|
|
})
|
|
|
|
It("has the right length for a short header with a 2 byte packet number", func() {
|
|
h := &Header{PacketNumberLen: protocol.PacketNumberLen2}
|
|
Expect(h.getHeaderLength()).To(Equal(protocol.ByteCount(1 + 2)))
|
|
err := h.writeHeader(buf)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(buf.Len()).To(Equal(3))
|
|
})
|
|
|
|
It("has the right length for a short header with a 5 byte packet number", func() {
|
|
h := &Header{PacketNumberLen: protocol.PacketNumberLen4}
|
|
Expect(h.getHeaderLength()).To(Equal(protocol.ByteCount(1 + 4)))
|
|
err := h.writeHeader(buf)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(buf.Len()).To(Equal(5))
|
|
})
|
|
|
|
It("errors when given an invalid packet number length", func() {
|
|
h := &Header{PacketNumberLen: 5}
|
|
_, err := h.getHeaderLength()
|
|
Expect(err).To(MatchError("invalid packet number length: 5"))
|
|
})
|
|
})
|
|
|
|
Context("logging", func() {
|
|
var (
|
|
buf *bytes.Buffer
|
|
logger utils.Logger
|
|
)
|
|
|
|
BeforeEach(func() {
|
|
buf = &bytes.Buffer{}
|
|
logger = utils.DefaultLogger
|
|
logger.SetLogLevel(utils.LogLevelDebug)
|
|
log.SetOutput(buf)
|
|
})
|
|
|
|
AfterEach(func() {
|
|
log.SetOutput(os.Stdout)
|
|
})
|
|
|
|
It("logs version negotiation packets", func() {
|
|
destConnID := protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37}
|
|
srcConnID := protocol.ConnectionID{0xde, 0xca, 0xfb, 0xad, 0x013, 0x37, 0x13, 0x37}
|
|
data, err := ComposeVersionNegotiation(destConnID, srcConnID, []protocol.VersionNumber{0x12345678, 0x87654321})
|
|
Expect(err).ToNot(HaveOccurred())
|
|
hdr, err := parseLongHeader(bytes.NewReader(data[1:]), data[0])
|
|
Expect(err).ToNot(HaveOccurred())
|
|
hdr.logHeader(logger)
|
|
Expect(buf.String()).To(ContainSubstring("VersionNegotiationPacket{DestConnectionID: 0xdeadbeefcafe1337, SrcConnectionID: 0xdecafbad13371337"))
|
|
Expect(buf.String()).To(ContainSubstring("0x12345678"))
|
|
Expect(buf.String()).To(ContainSubstring("0x87654321"))
|
|
})
|
|
|
|
It("logs Long Headers", func() {
|
|
(&Header{
|
|
IsLongHeader: true,
|
|
Type: protocol.PacketTypeHandshake,
|
|
PacketNumber: 0x1337,
|
|
PacketNumberLen: protocol.PacketNumberLen2,
|
|
PayloadLen: 54321,
|
|
DestConnectionID: protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37},
|
|
SrcConnectionID: protocol.ConnectionID{0xde, 0xca, 0xfb, 0xad, 0x013, 0x37, 0x13, 0x37},
|
|
Version: 0xfeed,
|
|
}).logHeader(logger)
|
|
Expect(buf.String()).To(ContainSubstring("Long Header{Type: Handshake, DestConnectionID: 0xdeadbeefcafe1337, SrcConnectionID: 0xdecafbad13371337, PacketNumber: 0x1337, PacketNumberLen: 2, PayloadLen: 54321, Version: 0xfeed}"))
|
|
})
|
|
|
|
It("logs Short Headers containing a connection ID", func() {
|
|
(&Header{
|
|
KeyPhase: 1,
|
|
PacketNumber: 0x1337,
|
|
PacketNumberLen: 4,
|
|
DestConnectionID: protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37},
|
|
}).logHeader(logger)
|
|
Expect(buf.String()).To(ContainSubstring("Short Header{DestConnectionID: 0xdeadbeefcafe1337, PacketNumber: 0x1337, PacketNumberLen: 4, KeyPhase: 1}"))
|
|
})
|
|
})
|
|
})
|