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implement the new header format

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Currently, we're only sending and accepting packets with matching source
and destination connection IDs.
This commit is contained in:
Marten Seemann 2018-04-06 10:03:34 +07:00
parent 1a035a265c
commit 52d31dd7ef
19 changed files with 527 additions and 344 deletions
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12
internal/wire/version_negotiation.go
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@ -20,16 +20,22 @@ func ComposeGQUICVersionNegotiation(connID protocol.ConnectionID, versions []pro
}
// ComposeVersionNegotiation composes a Version Negotiation according to the IETF draft
func ComposeVersionNegotiation(connID protocol.ConnectionID, versions []protocol.VersionNumber) []byte {
func ComposeVersionNegotiation(destConnID, srcConnID protocol.ConnectionID, versions []protocol.VersionNumber) ([]byte, error) {
greasedVersions := protocol.GetGreasedVersions(versions)
buf := bytes.NewBuffer(make([]byte, 0, 1+8+4+len(greasedVersions)*4))
r := make([]byte, 1)
_, _ = rand.Read(r) // ignore the error here. It is not critical to have perfect random here.
buf.WriteByte(r[0] | 0x80)
buf.Write(connID)
utils.BigEndian.WriteUint32(buf, 0) // version 0
connIDLen, err := encodeConnIDLen(destConnID, srcConnID)
if err != nil {
return nil, err
}
buf.WriteByte(connIDLen)
buf.Write(destConnID)
buf.Write(srcConnID)
for _, v := range greasedVersions {
utils.BigEndian.WriteUint32(buf, uint32(v))
}
return buf.Bytes()
return buf.Bytes(), nil
}