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echo the offered version in IETF Version Negotiation Packets

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This commit is contained in:
Marten Seemann 2017-11-12 14:37:43 +08:00
parent bf1ee17e67
commit 234d5aab36
4 changed files with 13 additions and 5 deletions
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5
internal/wire/header_test.go
View file

@ -115,14 +115,15 @@ var _ = Describe("Header", func() {
Expect(hdr.SupportedVersions).To(Equal(versions))
})
It("parses a gQUIC Version Negotiation Packet", func() {
It("parses an IETF draft style Version Negotiation Packet", func() {
versions := []protocol.VersionNumber{0x13, 0x37}
data := ComposeVersionNegotiation(0x42, 0x77, versions)
data := ComposeVersionNegotiation(0x42, 0x77, 0x4321, versions)
hdr, err := ParseHeaderSentByServer(bytes.NewReader(data), protocol.VersionUnknown)
Expect(err).ToNot(HaveOccurred())
Expect(hdr.isPublicHeader).To(BeFalse())
Expect(hdr.ConnectionID).To(Equal(protocol.ConnectionID(0x42)))
Expect(hdr.PacketNumber).To(Equal(protocol.PacketNumber(0x77)))
Expect(hdr.Version).To(Equal(protocol.VersionNumber(0x4321)))
Expect(hdr.SupportedVersions).To(Equal(versions))
Expect(hdr.Type).To(Equal(protocol.PacketTypeVersionNegotiation))
})

8
internal/wire/version_negotiation.go
View file

@ -26,13 +26,19 @@ func ComposeGQUICVersionNegotiation(connID protocol.ConnectionID, versions []pro
}
// ComposeVersionNegotiation composes a Version Negotiation according to the IETF draft
func ComposeVersionNegotiation(connID protocol.ConnectionID, pn protocol.PacketNumber, versions []protocol.VersionNumber) []byte {
func ComposeVersionNegotiation(
connID protocol.ConnectionID,
pn protocol.PacketNumber,
versionOffered protocol.VersionNumber,
versions []protocol.VersionNumber,
) []byte {
fullReply := &bytes.Buffer{}
ph := Header{
IsLongHeader: true,
Type: protocol.PacketTypeVersionNegotiation,
ConnectionID: connID,
PacketNumber: pn,
Version: versionOffered,
}
if err := ph.writeHeader(fullReply); err != nil {
utils.Errorf("error composing version negotiation packet: %s", err.Error())

3
internal/wire/version_negotiation_test.go
View file

@ -21,12 +21,13 @@ var _ = Describe("Version Negotiation Packets", func() {
It("writes IETF draft style", func() {
versions := []protocol.VersionNumber{1001, 1003}
data := ComposeVersionNegotiation(0x1337, 0x42, versions)
data := ComposeVersionNegotiation(0x1337, 0x42, 0x1234, versions)
hdr, err := parseHeader(bytes.NewReader(data), protocol.PerspectiveServer)
Expect(err).ToNot(HaveOccurred())
Expect(hdr.Type).To(Equal(protocol.PacketTypeVersionNegotiation))
Expect(hdr.ConnectionID).To(Equal(protocol.ConnectionID(0x1337)))
Expect(hdr.PacketNumber).To(Equal(protocol.PacketNumber(0x42)))
Expect(hdr.Version).To(Equal(protocol.VersionNumber(0x1234)))
Expect(hdr.SupportedVersions).To(Equal(versions))
})
})

2
server.go
View file

@ -280,7 +280,7 @@ func (s *server) handlePacket(pconn net.PacketConn, remoteAddr net.Addr, packet
}
// send an IETF draft style Version Negotiation Packet, if the client sent an unsupported version with an IETF draft style header
if hdr.Type == protocol.PacketTypeInitial && !protocol.IsSupportedVersion(s.config.Versions, hdr.Version) {
_, err := pconn.WriteTo(wire.ComposeVersionNegotiation(hdr.ConnectionID, hdr.PacketNumber, s.config.Versions), remoteAddr)
_, err := pconn.WriteTo(wire.ComposeVersionNegotiation(hdr.ConnectionID, hdr.PacketNumber, hdr.Version, s.config.Versions), remoteAddr)
return err
}