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only send Version Negotiation packets for packets larger than 1200 bytes

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This commit is contained in:
Marten Seemann 2020-10-08 12:51:51 +07:00
parent fb22bb38ea
commit 0615d92ede
3 changed files with 35 additions and 1 deletions
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25
server_test.go
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@ -385,7 +385,7 @@ var _ = Describe("Server", func() {
SrcConnectionID: srcConnID,
DestConnectionID: destConnID,
Version: 0x42,
}, make([]byte, protocol.MinInitialPacketSize))
}, make([]byte, protocol.MinUnknownVersionPacketSize))
raddr := &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1337}
packet.remoteAddr = raddr
tracer.EXPECT().SentPacket(packet.remoteAddr, gomock.Any(), gomock.Any(), nil).Do(func(_ net.Addr, replyHdr *logging.Header, _ logging.ByteCount, _ []logging.Frame) {
@ -431,6 +431,29 @@ var _ = Describe("Server", func() {
time.Sleep(scaleDuration(20 * time.Millisecond))
})
It("doesn't send a Version Negotiation Packet for unsupported versions, if the packet is too small", func() {
srcConnID := protocol.ConnectionID{1, 2, 3, 4, 5}
destConnID := protocol.ConnectionID{1, 2, 3, 4, 5, 6}
p := getPacket(&wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeHandshake,
SrcConnectionID: srcConnID,
DestConnectionID: destConnID,
Version: 0x42,
}, make([]byte, protocol.MinUnknownVersionPacketSize-50))
Expect(p.Size()).To(BeNumerically("<", protocol.MinUnknownVersionPacketSize))
raddr := &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1337}
p.remoteAddr = raddr
done := make(chan struct{})
tracer.EXPECT().DroppedPacket(raddr, logging.PacketTypeNotDetermined, p.Size(), logging.PacketDropUnexpectedPacket).Do(func(net.Addr, logging.PacketType, protocol.ByteCount, logging.PacketDropReason) {
close(done)
})
serv.handlePacket(p)
Eventually(done).Should(BeClosed())
// make sure no other packet is sent
time.Sleep(scaleDuration(20 * time.Millisecond))
})
It("replies with a Retry packet, if a Token is required", func() {
serv.config.AcceptToken = func(_ net.Addr, _ *Token) bool { return false }
hdr := &wire.Header{