yggdrasil-network/yggdrasil-go
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add (but don't use) offset field for (protocol) traffic packets

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This commit is contained in:
Arceliar 2020-11-07 06:18:09 -06:00
parent f1e9837a98
commit 92dbb48eda
4 changed files with 22 additions and 10 deletions
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18
src/yggdrasil/wire.go
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@ -222,6 +222,7 @@ func wire_chop_uint64(toUInt64 *uint64, fromSlice *[]byte) bool {
// The wire format for ordinary IPv6 traffic encapsulated by the network.
type wire_trafficPacket struct {
Offset uint64
Coords []byte
Handle crypto.Handle
Nonce crypto.BoxNonce
@ -233,6 +234,7 @@ type wire_trafficPacket struct {
func (p *wire_trafficPacket) encode() []byte {
bs := pool_getBytes(0)
bs = wire_put_uint64(wire_Traffic, bs)
bs = wire_put_uint64(p.Offset, bs)
bs = wire_put_coords(p.Coords, bs)
bs = append(bs, p.Handle[:]...)
bs = append(bs, p.Nonce[:]...)
@ -250,6 +252,8 @@ func (p *wire_trafficPacket) decode(bs []byte) bool {
return false
case pType != wire_Traffic:
return false
case !wire_chop_uint64(&p.Offset, &bs):
return false
case !wire_chop_coords(&p.Coords, &bs):
return false
case !wire_chop_slice(p.Handle[:], &bs):
@ -263,6 +267,7 @@ func (p *wire_trafficPacket) decode(bs []byte) bool {
// The wire format for protocol traffic, such as dht req/res or session ping/pong packets.
type wire_protoTrafficPacket struct {
Offset uint64
Coords []byte
ToKey crypto.BoxPubKey
FromKey crypto.BoxPubKey
@ -274,6 +279,7 @@ type wire_protoTrafficPacket struct {
func (p *wire_protoTrafficPacket) encode() []byte {
coords := wire_encode_coords(p.Coords)
bs := wire_encode_uint64(wire_ProtocolTraffic)
bs = wire_put_uint64(p.Offset, bs)
bs = append(bs, coords...)
bs = append(bs, p.ToKey[:]...)
bs = append(bs, p.FromKey[:]...)
@ -290,6 +296,8 @@ func (p *wire_protoTrafficPacket) decode(bs []byte) bool {
return false
case pType != wire_ProtocolTraffic:
return false
case !wire_chop_uint64(&p.Offset, &bs):
return false
case !wire_chop_coords(&p.Coords, &bs):
return false
case !wire_chop_slice(p.ToKey[:], &bs):
@ -303,6 +311,16 @@ func (p *wire_protoTrafficPacket) decode(bs []byte) bool {
return true
}
// Get the offset and coord slices of a (protocol) traffic packet without decoding
func wire_getTrafficOffsetAndCoords(packet []byte) ([]byte, []byte) {
_, offsetBegin := wire_decode_uint64(packet)
_, offsetLen := wire_decode_uint64(packet[offsetBegin:])
offsetEnd := offsetBegin + offsetLen
offset := packet[offsetBegin:offsetEnd]
coords, _ := wire_decode_coords(packet[offsetEnd:])
return offset, coords
}
// The wire format for link protocol traffic, namely switchMsg.
// There's really two layers of this, with the outer layer using permanent keys, and the inner layer using ephemeral keys.
// The keys themselves are exchanged as part of the connection setup, and then omitted from the packets.