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27 lines
846 B
Go
27 lines
846 B
Go
package wire
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import (
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"bytes"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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)
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// ComposeVersionNegotiation composes a Version Negotiation Packet
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// TODO(894): implement the IETF draft format of Version Negotiation Packets
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func ComposeVersionNegotiation(connectionID protocol.ConnectionID, versions []protocol.VersionNumber) []byte {
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fullReply := &bytes.Buffer{}
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ph := Header{
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ConnectionID: connectionID,
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PacketNumber: 1,
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VersionFlag: true,
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}
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err := ph.writePublicHeader(fullReply, protocol.PerspectiveServer, protocol.VersionWhatever)
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if err != nil {
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utils.Errorf("error composing version negotiation packet: %s", err.Error())
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}
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for _, v := range versions {
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utils.LittleEndian.WriteUint32(fullReply, protocol.VersionNumberToTag(v))
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}
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return fullReply.Bytes()
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}
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