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ignore delayed version negotiation packets

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This commit is contained in:
Marten Seemann 2016-12-05 18:29:01 +07:00
parent 1a830dbdb7
commit 05c870ff6f
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GPG key ID: 3603F40B121FCDEA
2 changed files with 19 additions and 3 deletions
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11
client.go
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@ -20,8 +20,9 @@ type Client struct {
conn *net.UDPConn
hostname string
connectionID protocol.ConnectionID
version protocol.VersionNumber
connectionID protocol.ConnectionID
version protocol.VersionNumber
versionNegotiated bool
session packetHandler
}
@ -123,7 +124,10 @@ func (c *Client) handlePacket(packet []byte) error {
}
hdr.Raw = packet[:len(packet)-r.Len()]
// TODO: ignore delayed / duplicated version negotiation packets
// ignore delayed / duplicated version negotiation packets
if c.versionNegotiated && hdr.VersionFlag {
return nil
}
if hdr.VersionFlag {
// check if the server sent the offered version in supported versions
@ -140,6 +144,7 @@ func (c *Client) handlePacket(packet []byte) error {
utils.Infof("Switching to QUIC version %d", highestSupportedVersion)
c.version = highestSupportedVersion
c.versionNegotiated = true
c.session.Close(errCloseSessionForNewVersion)
err = c.createNewSession()
if err != nil {

11
client_test.go
View file

@ -150,6 +150,7 @@ var _ = Describe("Client", func() {
Expect(session.packetCount).To(BeZero())
err := client.handlePacket(getVersionNegotiation([]protocol.VersionNumber{newVersion}))
Expect(client.version).To(Equal(newVersion))
Expect(client.versionNegotiated).To(BeTrue())
// it swapped the sessions
Expect(client.session).ToNot(Equal(session))
Expect(err).ToNot(HaveOccurred())
@ -165,6 +166,16 @@ var _ = Describe("Client", func() {
Expect(err).To(MatchError(qerr.VersionNegotiationMismatch))
})
It("ignores delayed version negotiation packets", func() {
// if the version was not yet negotiated, handlePacket would return a VersionNegotiationMismatch error, see above test
client.versionNegotiated = true
Expect(session.packetCount).To(BeZero())
err := client.handlePacket(getVersionNegotiation([]protocol.VersionNumber{1}))
Expect(err).ToNot(HaveOccurred())
Expect(client.versionNegotiated).To(BeTrue())
Expect(session.packetCount).To(BeZero())
})
It("errors if the server should have accepted the offered version", func() {
err := client.handlePacket(getVersionNegotiation([]protocol.VersionNumber{client.version}))
Expect(err).To(MatchError(errInvalidVersionNegotiation))