mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-04 20:57:36 +03:00
change the transport parameter format to varint
This commit is contained in:
Marten Seemann
parent
f5d88d3edd
commit
9ee6efd506
2 changed files with 65 additions and 105 deletions
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@ -2,7 +2,6 @@ package handshake
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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"math/rand"
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@ -16,12 +15,6 @@ import (
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)
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var _ = Describe("Transport Parameters", func() {
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prependLength := func(tp []byte) []byte {
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data := make([]byte, 2)
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binary.BigEndian.PutUint16(data, uint16(len(tp)))
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return append(data, tp...)
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}
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getRandomValue := func() uint64 {
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maxVals := []int64{math.MaxUint8 / 4, math.MaxUint16 / 4, math.MaxUint32 / 4, math.MaxUint64 / 4}
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return uint64(rand.Int63n(maxVals[int(rand.Int31n(4))]))
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@ -103,42 +96,31 @@ var _ = Describe("Transport Parameters", func() {
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Expect(p.ActiveConnectionIDLimit).To(Equal(params.ActiveConnectionIDLimit))
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})
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It("errors if the transport parameters are too short to contain the length", func() {
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Expect((&TransportParameters{}).Unmarshal([]byte{0}, protocol.PerspectiveClient)).To(MatchError("TRANSPORT_PARAMETER_ERROR: transport parameter data too short"))
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})
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It("errors if the transport parameters are too short to contain the length", func() {
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data := make([]byte, 2)
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binary.BigEndian.PutUint16(data, 42)
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data = append(data, make([]byte, 41)...)
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Expect((&TransportParameters{}).Unmarshal(data, protocol.PerspectiveClient)).To(MatchError("TRANSPORT_PARAMETER_ERROR: expected transport parameters to be 42 bytes long, have 41"))
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})
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It("errors when the stateless_reset_token has the wrong length", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, uint16(statelessResetTokenParameterID))
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utils.BigEndian.WriteUint16(b, 15)
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utils.WriteVarInt(b, uint64(statelessResetTokenParameterID))
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utils.WriteVarInt(b, 15)
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b.Write(make([]byte, 15))
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: wrong length for stateless_reset_token: 15 (expected 16)"))
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: wrong length for stateless_reset_token: 15 (expected 16)"))
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})
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It("errors when the max_packet_size is too small", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, uint16(maxPacketSizeParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(1199)))
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utils.WriteVarInt(b, uint64(maxPacketSizeParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(1199)))
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utils.WriteVarInt(b, 1199)
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: invalid value for max_packet_size: 1199 (minimum 1200)"))
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: invalid value for max_packet_size: 1199 (minimum 1200)"))
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})
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It("errors when disable_active_migration has content", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, uint16(disableActiveMigrationParameterID))
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utils.BigEndian.WriteUint16(b, 6)
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utils.WriteVarInt(b, uint64(disableActiveMigrationParameterID))
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utils.WriteVarInt(b, 6)
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b.Write([]byte("foobar"))
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: wrong length for disable_active_migration: 6 (expected empty)"))
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: wrong length for disable_active_migration: 6 (expected empty)"))
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})
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It("errors when the max_ack_delay is too large", func() {
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@ -151,13 +133,15 @@ var _ = Describe("Transport Parameters", func() {
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const num = 1000
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var defaultLen, dataLen int
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// marshal 1000 times to average out the greasing transport parameter
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maxAckDelay := protocol.DefaultMaxAckDelay + time.Millisecond
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for i := 0; i < num; i++ {
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dataDefault := (&TransportParameters{MaxAckDelay: protocol.DefaultMaxAckDelay}).Marshal()
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defaultLen += len(dataDefault)
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data := (&TransportParameters{MaxAckDelay: protocol.DefaultMaxAckDelay + time.Millisecond}).Marshal()
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data := (&TransportParameters{MaxAckDelay: maxAckDelay}).Marshal()
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dataLen += len(data)
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}
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Expect(float32(dataLen) / num).To(BeNumerically("~", float32(defaultLen)/num+2 /* parameter ID */ +2 /* length field */ +1 /* value */, 1))
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entryLen := utils.VarIntLen(uint64(ackDelayExponentParameterID)) /* parameter id */ + utils.VarIntLen(uint64(utils.VarIntLen(uint64(maxAckDelay.Milliseconds())))) /*length */ + utils.VarIntLen(uint64(maxAckDelay.Milliseconds())) /* value */
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Expect(float32(dataLen) / num).To(BeNumerically("~", float32(defaultLen)/num+float32(entryLen), 1))
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})
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It("errors when the ack_delay_exponenent is too large", func() {
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@ -176,7 +160,8 @@ var _ = Describe("Transport Parameters", func() {
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data := (&TransportParameters{AckDelayExponent: protocol.DefaultAckDelayExponent + 1}).Marshal()
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dataLen += len(data)
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}
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Expect(float32(dataLen) / num).To(BeNumerically("~", float32(defaultLen)/num+2 /* parameter ID */ +2 /* length field */ +1 /* value */, 1))
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entryLen := utils.VarIntLen(uint64(ackDelayExponentParameterID)) /* parameter id */ + utils.VarIntLen(uint64(utils.VarIntLen(protocol.DefaultAckDelayExponent+1))) /* length */ + utils.VarIntLen(protocol.DefaultAckDelayExponent+1) /* value */
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Expect(float32(dataLen) / num).To(BeNumerically("~", float32(defaultLen)/num+float32(entryLen), 1))
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})
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It("sets the default value for the ack_delay_exponent, when no value was sent", func() {
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@ -188,13 +173,13 @@ var _ = Describe("Transport Parameters", func() {
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It("errors when the varint value has the wrong length", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiLocalParameterID))
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utils.BigEndian.WriteUint16(b, 2)
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiLocalParameterID))
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utils.WriteVarInt(b, 2)
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val := uint64(0xdeadbeef)
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Expect(utils.VarIntLen(val)).ToNot(BeEquivalentTo(2))
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utils.WriteVarInt(b, val)
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p := &TransportParameters{}
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err := p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)
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err := p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)
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Expect(err).To(HaveOccurred())
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Expect(err.Error()).To(ContainSubstring("TRANSPORT_PARAMETER_ERROR: inconsistent transport parameter length"))
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})
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@ -202,30 +187,30 @@ var _ = Describe("Transport Parameters", func() {
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It("handles max_ack_delays that decode to a negative duration", func() {
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b := &bytes.Buffer{}
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val := uint64(math.MaxUint64) / 5
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utils.BigEndian.WriteUint16(b, uint16(maxAckDelayParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(val)))
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utils.WriteVarInt(b, uint64(maxAckDelayParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(val)))
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utils.WriteVarInt(b, val)
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(Succeed())
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(Succeed())
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Expect(p.MaxAckDelay).To(BeNumerically(">", 290*365*24*time.Hour))
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})
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It("skips unknown parameters", func() {
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b := &bytes.Buffer{}
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// write a known parameter
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiLocalParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiLocalParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, 0x1337)
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// write an unknown parameter
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utils.BigEndian.WriteUint16(b, 0x42)
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utils.BigEndian.WriteUint16(b, 6)
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utils.WriteVarInt(b, 0x42)
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utils.WriteVarInt(b, 6)
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b.Write([]byte("foobar"))
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// write a known parameter
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiRemoteParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x42)))
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiRemoteParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(0x42)))
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utils.WriteVarInt(b, 0x42)
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(Succeed())
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(Succeed())
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Expect(p.InitialMaxStreamDataBidiLocal).To(Equal(protocol.ByteCount(0x1337)))
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Expect(p.InitialMaxStreamDataBidiRemote).To(Equal(protocol.ByteCount(0x42)))
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})
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@ -233,40 +218,30 @@ var _ = Describe("Transport Parameters", func() {
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It("rejects duplicate parameters", func() {
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b := &bytes.Buffer{}
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// write first parameter
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiLocalParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiLocalParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, 0x1337)
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// write a second parameter
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiRemoteParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x42)))
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiRemoteParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(0x42)))
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utils.WriteVarInt(b, 0x42)
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// write first parameter again
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiLocalParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, uint64(initialMaxStreamDataBidiLocalParameterID))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, 0x1337)
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p := &TransportParameters{}
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err := p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)
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err := p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)
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Expect(err).To(HaveOccurred())
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Expect(err.Error()).To(ContainSubstring("received duplicate transport parameter"))
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})
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It("errors if there's not enough data to read", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, 0x42)
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utils.BigEndian.WriteUint16(b, 7)
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utils.WriteVarInt(b, 0x42)
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utils.WriteVarInt(b, 7)
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b.Write([]byte("foobar"))
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: remaining length (6) smaller than parameter length (7)"))
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})
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It("errors if there's unprocessed data after reading", func() {
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b := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(b, uint16(initialMaxStreamDataBidiLocalParameterID))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(0x1337)))
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utils.WriteVarInt(b, 0x1337)
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b.Write([]byte("foo"))
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(b.Bytes()), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: should have read all data. Still have 3 bytes"))
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Expect(p.Unmarshal(b.Bytes(), protocol.PerspectiveServer)).To(MatchError("TRANSPORT_PARAMETER_ERROR: remaining length (6) smaller than parameter length (7)"))
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})
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It("errors if the client sent a stateless_reset_token", func() {
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@ -324,10 +299,10 @@ var _ = Describe("Transport Parameters", func() {
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}
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for i := 1; i < len(raw); i++ {
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buf := &bytes.Buffer{}
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utils.BigEndian.WriteUint16(buf, uint16(preferredAddressParamaterID))
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buf.Write(prependLength(raw[:i]))
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utils.WriteVarInt(buf, uint64(preferredAddressParamaterID))
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buf.Write(raw[:i])
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p := &TransportParameters{}
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Expect(p.Unmarshal(prependLength(buf.Bytes()), protocol.PerspectiveServer)).ToNot(Succeed())
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Expect(p.Unmarshal(buf.Bytes(), protocol.PerspectiveServer)).ToNot(Succeed())
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}
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})
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})
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@ -2,7 +2,6 @@ package handshake
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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@ -23,7 +22,7 @@ func init() {
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rand.Seed(time.Now().UTC().UnixNano())
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}
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type transportParameterID uint16
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type transportParameterID uint64
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const (
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originalConnectionIDParameterID transportParameterID = 0x0
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@ -88,25 +87,23 @@ func (p *TransportParameters) Unmarshal(data []byte, sentBy protocol.Perspective
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}
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func (p *TransportParameters) unmarshal(data []byte, sentBy protocol.Perspective) error {
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if len(data) < 2 {
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return errors.New("transport parameter data too short")
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}
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length := binary.BigEndian.Uint16(data[:2])
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if len(data)-2 < int(length) {
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return fmt.Errorf("expected transport parameters to be %d bytes long, have %d", length, len(data)-2)
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}
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// needed to check that every parameter is only sent at most once
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var parameterIDs []transportParameterID
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var readAckDelayExponent bool
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var readMaxAckDelay bool
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r := bytes.NewReader(data[2:])
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for r.Len() >= 4 {
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paramIDInt, _ := utils.BigEndian.ReadUint16(r)
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r := bytes.NewReader(data)
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for r.Len() > 0 {
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paramIDInt, err := utils.ReadVarInt(r)
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if err != nil {
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return err
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}
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paramID := transportParameterID(paramIDInt)
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paramLen, _ := utils.BigEndian.ReadUint16(r)
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paramLen, err := utils.ReadVarInt(r)
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if err != nil {
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return err
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}
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parameterIDs = append(parameterIDs, paramID)
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switch paramID {
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case ackDelayExponentParameterID:
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@ -187,9 +184,6 @@ func (p *TransportParameters) unmarshal(data []byte, sentBy protocol.Perspective
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}
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}
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if r.Len() != 0 {
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return fmt.Errorf("should have read all data. Still have %d bytes", r.Len())
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}
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return nil
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}
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@ -293,14 +287,13 @@ func (p *TransportParameters) readNumericTransportParameter(
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// Marshal the transport parameters
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func (p *TransportParameters) Marshal() []byte {
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b := &bytes.Buffer{}
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b.Write([]byte{0, 0}) // length. Will be replaced later
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//add a greased value
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utils.BigEndian.WriteUint16(b, uint16(27+31*rand.Intn(100)))
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utils.WriteVarInt(b, uint64(27+31*rand.Intn(100)))
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length := rand.Intn(16)
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randomData := make([]byte, length)
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rand.Read(randomData)
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utils.BigEndian.WriteUint16(b, uint16(length))
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utils.WriteVarInt(b, uint64(length))
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b.Write(randomData)
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// initial_max_stream_data_bidi_local
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@ -331,17 +324,17 @@ func (p *TransportParameters) Marshal() []byte {
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}
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// disable_active_migration
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if p.DisableActiveMigration {
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utils.BigEndian.WriteUint16(b, uint16(disableActiveMigrationParameterID))
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utils.BigEndian.WriteUint16(b, 0)
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utils.WriteVarInt(b, uint64(disableActiveMigrationParameterID))
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utils.WriteVarInt(b, 0)
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}
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if p.StatelessResetToken != nil {
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utils.BigEndian.WriteUint16(b, uint16(statelessResetTokenParameterID))
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utils.BigEndian.WriteUint16(b, 16)
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utils.WriteVarInt(b, uint64(statelessResetTokenParameterID))
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utils.WriteVarInt(b, 16)
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b.Write(p.StatelessResetToken[:])
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}
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if p.PreferredAddress != nil {
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utils.BigEndian.WriteUint16(b, uint16(preferredAddressParamaterID))
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utils.BigEndian.WriteUint16(b, 4+2+16+2+1+uint16(p.PreferredAddress.ConnectionID.Len())+16)
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utils.WriteVarInt(b, uint64(preferredAddressParamaterID))
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utils.WriteVarInt(b, 4+2+16+2+1+uint64(p.PreferredAddress.ConnectionID.Len())+16)
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ipv4 := p.PreferredAddress.IPv4
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b.Write(ipv4[len(ipv4)-4:])
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utils.BigEndian.WriteUint16(b, p.PreferredAddress.IPv4Port)
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@ -352,22 +345,19 @@ func (p *TransportParameters) Marshal() []byte {
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b.Write(p.PreferredAddress.StatelessResetToken[:])
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}
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if p.OriginalConnectionID.Len() > 0 {
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utils.BigEndian.WriteUint16(b, uint16(originalConnectionIDParameterID))
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utils.BigEndian.WriteUint16(b, uint16(p.OriginalConnectionID.Len()))
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utils.WriteVarInt(b, uint64(originalConnectionIDParameterID))
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utils.WriteVarInt(b, uint64(p.OriginalConnectionID.Len()))
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b.Write(p.OriginalConnectionID.Bytes())
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}
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// active_connection_id_limit
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p.marshalVarintParam(b, activeConnectionIDLimitParameterID, p.ActiveConnectionIDLimit)
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data := b.Bytes()
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binary.BigEndian.PutUint16(data[:2], uint16(b.Len()-2))
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return data
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return b.Bytes()
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}
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func (p *TransportParameters) marshalVarintParam(b *bytes.Buffer, id transportParameterID, val uint64) {
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utils.BigEndian.WriteUint16(b, uint16(id))
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utils.BigEndian.WriteUint16(b, uint16(utils.VarIntLen(val)))
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utils.WriteVarInt(b, uint64(id))
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utils.WriteVarInt(b, uint64(utils.VarIntLen(val)))
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utils.WriteVarInt(b, val)
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}
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@ -381,8 +371,6 @@ func (p *TransportParameters) marshalVarintParam(b *bytes.Buffer, id transportPa
|
|||
// For convenience, we use the same format that we also use for sending the transport parameters.
|
||||
func (p *TransportParameters) MarshalForSessionTicket(b *bytes.Buffer) {
|
||||
utils.WriteVarInt(b, transportParameterMarshalingVersion)
|
||||
startLen := b.Len()
|
||||
b.Write([]byte{0, 0}) // length. Will be replaced later
|
||||
|
||||
// initial_max_stream_data_bidi_local
|
||||
p.marshalVarintParam(b, initialMaxStreamDataBidiLocalParameterID, uint64(p.InitialMaxStreamDataBidiLocal))
|
||||
|
|
@ -396,9 +384,6 @@ func (p *TransportParameters) MarshalForSessionTicket(b *bytes.Buffer) {
|
|||
p.marshalVarintParam(b, initialMaxStreamsBidiParameterID, uint64(p.MaxBidiStreamNum))
|
||||
// initial_max_uni_streams
|
||||
p.marshalVarintParam(b, initialMaxStreamsUniParameterID, uint64(p.MaxUniStreamNum))
|
||||
|
||||
// replace the length
|
||||
binary.BigEndian.PutUint16(b.Bytes()[startLen:startLen+2], uint16(b.Len()-2-startLen))
|
||||
}
|
||||
|
||||
// UnmarshalFromSessionTicket unmarshals transport parameters from a session ticket.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue