J. David Lee
1d3cc1f959
Co-authored-by: jdl <jdl@desktop> Co-authored-by: jdl <jdl@crumpington.com> Reviewed-on: #3
121 lines
2.6 KiB
Go
121 lines
2.6 KiB
Go
package peer
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import (
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"net/netip"
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)
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const (
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packetTypeSyn = 1
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packetTypeInit = 2
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packetTypeAck = 3
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packetTypeProbe = 4
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packetTypeAddrDiscovery = 5
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)
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// ----------------------------------------------------------------------------
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type packetInit struct {
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TraceID uint64
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Direct bool
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Version uint64
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}
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func (p packetInit) Marshal(buf []byte) []byte {
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return newBinWriter(buf).
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Byte(packetTypeInit).
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Uint64(p.TraceID).
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Bool(p.Direct).
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Uint64(p.Version).
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Build()
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}
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func parsePacketInit(buf []byte) (p packetInit, err error) {
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err = newBinReader(buf[1:]).
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Uint64(&p.TraceID).
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Bool(&p.Direct).
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Uint64(&p.Version).
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Error()
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return
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}
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// ----------------------------------------------------------------------------
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type packetSyn struct {
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TraceID uint64 // TraceID to match response w/ request.
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SharedKey [32]byte // Our shared key.
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Direct bool
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PossibleAddrs [8]netip.AddrPort // Possible public addresses of the sender.
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}
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func (p packetSyn) Marshal(buf []byte) []byte {
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return newBinWriter(buf).
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Byte(packetTypeSyn).
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Uint64(p.TraceID).
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SharedKey(p.SharedKey).
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Bool(p.Direct).
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AddrPort8(p.PossibleAddrs).
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Build()
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}
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func parsePacketSyn(buf []byte) (p packetSyn, err error) {
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err = newBinReader(buf[1:]).
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Uint64(&p.TraceID).
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SharedKey(&p.SharedKey).
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Bool(&p.Direct).
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AddrPort8(&p.PossibleAddrs).
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Error()
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return
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}
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// ----------------------------------------------------------------------------
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type packetAck struct {
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TraceID uint64
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ToAddr netip.AddrPort
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PossibleAddrs [8]netip.AddrPort // Possible public addresses of the sender.
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}
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func (p packetAck) Marshal(buf []byte) []byte {
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return newBinWriter(buf).
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Byte(packetTypeAck).
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Uint64(p.TraceID).
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AddrPort(p.ToAddr).
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AddrPort8(p.PossibleAddrs).
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Build()
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}
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func parsePacketAck(buf []byte) (p packetAck, err error) {
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err = newBinReader(buf[1:]).
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Uint64(&p.TraceID).
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AddrPort(&p.ToAddr).
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AddrPort8(&p.PossibleAddrs).
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Error()
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return
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}
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// ----------------------------------------------------------------------------
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// A probeReqPacket is sent from a client to a server to determine if direct
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// UDP communication can be used.
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type packetProbe struct {
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TraceID uint64
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}
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func (p packetProbe) Marshal(buf []byte) []byte {
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return newBinWriter(buf).
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Byte(packetTypeProbe).
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Uint64(p.TraceID).
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Build()
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}
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func parsePacketProbe(buf []byte) (p packetProbe, err error) {
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err = newBinReader(buf[1:]).
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Uint64(&p.TraceID).
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Error()
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return
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}
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// ----------------------------------------------------------------------------
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type packetLocalDiscovery struct{}
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