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identify version negotiation packets without parsing the header

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This commit is contained in:
Marten Seemann 2019-02-04 16:20:50 +08:00
parent 14426dfa12
commit df34e4496e
5 changed files with 35 additions and 12 deletions
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15
internal/wire/header.go
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@ -35,6 +35,14 @@ func ParseConnectionID(data []byte, shortHeaderConnIDLen int) (protocol.Connecti
return protocol.ConnectionID(data[6 : 6+destConnIDLen]), nil
}
// IsVersionNegotiationPacket says if this is a version negotiation packet
func IsVersionNegotiationPacket(b []byte) bool {
if len(b) < 5 {
return false
}
return b[0]&0x80 > 0 && b[1] == 0 && b[2] == 0 && b[3] == 0 && b[4] == 0
}
var errUnsupportedVersion = errors.New("unsupported version")
// The Header is the version independent part of the header
@ -129,7 +137,7 @@ func (h *Header) parseLongHeader(b *bytes.Reader) error {
return err
}
h.Version = protocol.VersionNumber(v)
if !h.IsVersionNegotiation() && h.typeByte&0x40 == 0 {
if h.Version != 0 && h.typeByte&0x40 == 0 {
return errors.New("not a QUIC packet")
}
connIDLenByte, err := b.ReadByte()
@ -214,11 +222,6 @@ func (h *Header) parseVersionNegotiationPacket(b *bytes.Reader) error {
return nil
}
// IsVersionNegotiation says if this a version negotiation packet
func (h *Header) IsVersionNegotiation() bool {
return h.IsLongHeader && h.Version == 0
}
// ParsedLen returns the number of bytes that were consumed when parsing the header
func (h *Header) ParsedLen() protocol.ByteCount {
return h.parsedLen