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fix buffer size for version negotiation packets

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This commit is contained in:
Marten Seemann 2018-07-01 11:13:52 +07:00
parent 3f9212b5f7
commit 1f4335ffce
1 changed files with 2 additions and 1 deletions
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3
internal/wire/version_negotiation.go
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@ -22,7 +22,8 @@ func ComposeGQUICVersionNegotiation(connID protocol.ConnectionID, versions []pro
// ComposeVersionNegotiation composes a Version Negotiation according to the IETF draft
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))
expectedLen := 1 /* type byte */ + 4 /* version field */ + 1 /* connection ID length field */ + destConnID.Len() + srcConnID.Len() + len(greasedVersions)*4
buf := bytes.NewBuffer(make([]byte, 0, expectedLen))
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)