forked from quic-go/quic-go
b0f34e776e
Send a gQUIC Version Negotiation Packet, if the client packet has a Public Header. If the client has an IETF draft style header, send an IETF draft style Version Negotiation Packet.
46 lines
1.4 KiB
Go
46 lines
1.4 KiB
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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// ComposeGQUICVersionNegotiation composes a Version Negotiation Packet for gQUIC
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func ComposeGQUICVersionNegotiation(connID protocol.ConnectionID, versions []protocol.VersionNumber) []byte {
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fullReply := &bytes.Buffer{}
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ph := Header{
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ConnectionID: connID,
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PacketNumber: 1,
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VersionFlag: true,
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}
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if err := ph.writePublicHeader(fullReply, protocol.PerspectiveServer, protocol.VersionWhatever); err != nil {
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utils.Errorf("error composing version negotiation packet: %s", err.Error())
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return nil
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}
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for _, v := range versions {
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utils.BigEndian.WriteUint32(fullReply, uint32(v))
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}
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return fullReply.Bytes()
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}
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// ComposeVersionNegotiation composes a Version Negotiation according to the IETF draft
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func ComposeVersionNegotiation(connID protocol.ConnectionID, pn protocol.PacketNumber, versions []protocol.VersionNumber) []byte {
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fullReply := &bytes.Buffer{}
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ph := Header{
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IsLongHeader: true,
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Type: protocol.PacketTypeVersionNegotiation,
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ConnectionID: connID,
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PacketNumber: pn,
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}
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if err := ph.writeHeader(fullReply); err != nil {
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utils.Errorf("error composing version negotiation packet: %s", err.Error())
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return nil
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}
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for _, v := range versions {
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utils.BigEndian.WriteUint32(fullReply, uint32(v))
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}
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return fullReply.Bytes()
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}
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