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add path information to (protocol) traffic packets as they flow through the network, and a field for a reply path

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This commit is contained in:
Arceliar 2020-11-07 09:44:34 -06:00
parent 36e4ce4b0b
commit e2521de94d
3 changed files with 42 additions and 25 deletions
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1
src/yggdrasil/peer.go
View File

@ -262,6 +262,7 @@ func (p *peer) _handleTraffic(packet []byte) {
wire_put_uint64(offset, obs[:0])
}
}
packet = wire_put_uint64(uint64(next), packet)
if nPeer, isIn := p.ports[next]; isIn {
nPeer.sendPacketFrom(p, packet)
}

3
src/yggdrasil/stream.go
View File

@ -113,7 +113,8 @@ func (s *stream) readMsgFromBuffer() ([]byte, error) {
if msgLen > streamMsgSize {
return nil, errors.New("oversized message")
}
msg := pool_getBytes(int(msgLen))
msg := pool_getBytes(int(msgLen + 10)) // Extra padding for up to 1 more switchPort
msg = msg[msgLen:]
_, err = io.ReadFull(s.inputBuffer, msg)
return msg, err
}

63
src/yggdrasil/wire.go
View File

@ -96,9 +96,9 @@ func wire_encode_coords(coords []byte) []byte {
// Puts a length prefix and the coords into bs, returns the wire formatted coords.
// Useful in hot loops where we don't want to allocate and we know the rest of the later parts of the slice are safe to overwrite.
func wire_put_coords(coords []byte, bs []byte) []byte {
bs = wire_put_uint64(uint64(len(coords)), bs)
bs = append(bs, coords...)
func wire_put_vslice(slice []byte, bs []byte) []byte {
bs = wire_put_uint64(uint64(len(slice)), bs)
bs = append(bs, slice...)
return bs
}
@ -194,14 +194,14 @@ func wire_chop_slice(toSlice []byte, fromSlice *[]byte) bool {
return true
}
// A utility function to extract coords from a slice and advance the source slices, returning true if successful.
func wire_chop_coords(toCoords *[]byte, fromSlice *[]byte) bool {
coords, coordLen := wire_decode_coords(*fromSlice)
if coordLen == 0 {
// A utility function to extract a length-prefixed slice (such as coords) from a slice and advance the source slices, returning true if successful.
func wire_chop_vslice(toSlice *[]byte, fromSlice *[]byte) bool {
slice, sliceLen := wire_decode_coords(*fromSlice)
if sliceLen == 0 { // sliceLen is length-prefix size + slice size, in bytes
return false
}
*toCoords = append((*toCoords)[:0], coords...)
*fromSlice = (*fromSlice)[coordLen:]
*toSlice = append((*toSlice)[:0], slice...)
*fromSlice = (*fromSlice)[sliceLen:]
return true
}
@ -227,6 +227,8 @@ type wire_trafficPacket struct {
Handle crypto.Handle
Nonce crypto.BoxNonce
Payload []byte
RPath []byte
Path []byte
}
// Encodes a wire_trafficPacket into its wire format.
@ -235,10 +237,12 @@ 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 = wire_put_vslice(p.Coords, bs)
bs = append(bs, p.Handle[:]...)
bs = append(bs, p.Nonce[:]...)
bs = append(bs, p.Payload...)
bs = wire_put_vslice(p.Payload, bs)
bs = wire_put_vslice(p.RPath, bs)
bs = append(bs, p.Path...)
return bs
}
@ -254,14 +258,18 @@ func (p *wire_trafficPacket) decode(bs []byte) bool {
return false
case !wire_chop_uint64(&p.Offset, &bs):
return false
case !wire_chop_coords(&p.Coords, &bs):
case !wire_chop_vslice(&p.Coords, &bs):
return false
case !wire_chop_slice(p.Handle[:], &bs):
return false
case !wire_chop_slice(p.Nonce[:], &bs):
return false
case !wire_chop_vslice(&p.Payload, &bs):
return false
case !wire_chop_vslice(&p.RPath, &bs):
return false
}
p.Payload = append(p.Payload, bs...)
p.Path = bs
return true
}
@ -273,18 +281,21 @@ type wire_protoTrafficPacket struct {
FromKey crypto.BoxPubKey
Nonce crypto.BoxNonce
Payload []byte
RPath []byte
Path []byte
}
// Encodes a wire_protoTrafficPacket into its wire format.
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 = wire_put_vslice(p.Coords, bs)
bs = append(bs, p.ToKey[:]...)
bs = append(bs, p.FromKey[:]...)
bs = append(bs, p.Nonce[:]...)
bs = append(bs, p.Payload...)
bs = wire_put_vslice(p.Payload, bs)
bs = wire_put_vslice(p.RPath, bs)
bs = append(bs, p.Path...)
return bs
}
@ -298,7 +309,7 @@ func (p *wire_protoTrafficPacket) decode(bs []byte) bool {
return false
case !wire_chop_uint64(&p.Offset, &bs):
return false
case !wire_chop_coords(&p.Coords, &bs):
case !wire_chop_vslice(&p.Coords, &bs):
return false
case !wire_chop_slice(p.ToKey[:], &bs):
return false
@ -306,8 +317,12 @@ func (p *wire_protoTrafficPacket) decode(bs []byte) bool {
return false
case !wire_chop_slice(p.Nonce[:], &bs):
return false
case !wire_chop_vslice(&p.Payload, &bs):
return false
case !wire_chop_vslice(&p.RPath, &bs):
return false
}
p.Payload = bs
p.Path = bs
return true
}
@ -391,7 +406,7 @@ func (p *sessionPing) decode(bs []byte) bool {
return false
case !wire_chop_uint64(&tstamp, &bs):
return false
case !wire_chop_coords(&p.Coords, &bs):
case !wire_chop_vslice(&p.Coords, &bs):
return false
case !wire_chop_uint64(&mtu, &bs):
mtu = 1280
@ -415,7 +430,7 @@ func (p *nodeinfoReqRes) encode() []byte {
pTypeVal = wire_NodeInfoRequest
}
bs := wire_encode_uint64(pTypeVal)
bs = wire_put_coords(p.SendCoords, bs)
bs = wire_put_vslice(p.SendCoords, bs)
if pTypeVal == wire_NodeInfoResponse {
bs = append(bs, p.NodeInfo...)
}
@ -430,7 +445,7 @@ func (p *nodeinfoReqRes) decode(bs []byte) bool {
return false
case pType != wire_NodeInfoRequest && pType != wire_NodeInfoResponse:
return false
case !wire_chop_coords(&p.SendCoords, &bs):
case !wire_chop_vslice(&p.SendCoords, &bs):
return false
}
if p.IsResponse = pType == wire_NodeInfoResponse; p.IsResponse {
@ -464,7 +479,7 @@ func (r *dhtReq) decode(bs []byte) bool {
return false
case pType != wire_DHTLookupRequest:
return false
case !wire_chop_coords(&r.Coords, &bs):
case !wire_chop_vslice(&r.Coords, &bs):
return false
case !wire_chop_slice(r.Dest[:], &bs):
return false
@ -495,7 +510,7 @@ func (r *dhtRes) decode(bs []byte) bool {
return false
case pType != wire_DHTLookupResponse:
return false
case !wire_chop_coords(&r.Coords, &bs):
case !wire_chop_vslice(&r.Coords, &bs):
return false
case !wire_chop_slice(r.Dest[:], &bs):
return false
@ -505,7 +520,7 @@ func (r *dhtRes) decode(bs []byte) bool {
switch {
case !wire_chop_slice(info.key[:], &bs):
return false
case !wire_chop_coords(&info.coords, &bs):
case !wire_chop_vslice(&info.coords, &bs):
return false
}
r.Infos = append(r.Infos, &info)