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This commit is contained in:
jdl 2024-12-22 13:58:09 +01:00
parent 1d68e4f79e
commit a263f65c5d
3 changed files with 147 additions and 120 deletions
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24
node/packets.go
View File

@ -37,6 +37,10 @@ func (p *controlPacket) ParsePayload(buf []byte) (err error) {
p.Payload, err = parsePongPacket(buf)
case packetTypeSyn:
p.Payload, err = parseSynPacket(buf)
case packetTypeSynAck:
p.Payload, err = parseSynAckPacket(buf)
case packetTypeAck:
p.Payload, err = parseAckPacket(buf)
default:
return errUnknownPacketType
}
@ -49,7 +53,7 @@ type synPacket struct {
TraceID uint64 // TraceID to match response w/ request.
SharedKey [32]byte // Our shared key.
ServerAddr netip.AddrPort // The address we're sending to.
Direct bool // True if this is request isn't relayed.
RelayIP byte
}
func (p synPacket) Marshal(buf []byte) []byte {
@ -58,7 +62,7 @@ func (p synPacket) Marshal(buf []byte) []byte {
Uint64(p.TraceID).
SharedKey(p.SharedKey).
AddrPort(p.ServerAddr).
Bool(p.Direct).
Byte(p.RelayIP).
Build()
}
@ -67,7 +71,7 @@ func parseSynPacket(buf []byte) (p synPacket, err error) {
Uint64(&p.TraceID).
SharedKey(&p.SharedKey).
AddrPort(&p.ServerAddr).
Bool(&p.Direct).
Byte(&p.RelayIP).
Error()
return
}
@ -78,6 +82,10 @@ type synAckPacket struct {
TraceID uint64
}
func newSynAckPacket(traceID uint64) synAckPacket {
return synAckPacket{traceID}
}
func (p synAckPacket) Marshal(buf []byte) []byte {
return newBinWriter(buf).
Byte(packetTypeSynAck).
@ -100,7 +108,7 @@ type ackPacket struct {
func (p ackPacket) Marshal(buf []byte) []byte {
return newBinWriter(buf).
Byte(packetTypeSynAck).
Byte(packetTypeAck).
Uint64(p.TraceID).
Build()
}
@ -118,13 +126,11 @@ func parseAckPacket(buf []byte) (p ackPacket, err error) {
// as a server. It always contains the shared key the client is expecting
// to use for data encryption with the server.
type pingPacket struct {
SentAt int64 // UnixMilli. // Not used. Use traceID.
SharedKey [32]byte
SentAt int64 // UnixMilli. // Not used. Use traceID.
}
func newPingPacket(sharedKey [32]byte) (pp pingPacket) {
func newPingPacket() (pp pingPacket) {
pp.SentAt = time.Now().UnixMilli()
pp.SharedKey = sharedKey
return
}
@ -132,14 +138,12 @@ func (p pingPacket) Marshal(buf []byte) []byte {
return newBinWriter(buf).
Byte(packetTypePing).
Int64(p.SentAt).
SharedKey(p.SharedKey).
Build()
}
func parsePingPacket(buf []byte) (p pingPacket, err error) {
err = newBinReader(buf[1:]).
Int64(&p.SentAt).
SharedKey(&p.SharedKey).
Error()
return
}

233
node/peer-states.go
View File

@ -16,14 +16,11 @@ type peerState interface {
OnSynAck(netip.AddrPort, synAckPacket) peerState
OnAck(netip.AddrPort, ackPacket) peerState
// When the peer is updated, we reset. Handled by base state.
OnPeerUpdate(*m.Peer) peerState
// To determe up / dataCipher. Handled by base state.
OnPing(netip.AddrPort, pingPacket) peerState
OnPong(netip.AddrPort, pongPacket) peerState
OnPingTimer() peerState
OnTimeoutTimer() peerState
// When the peer is updated, we reset. Handled by base state.
OnPeerUpdate(*m.Peer) peerState
}
// ----------------------------------------------------------------------------
@ -82,37 +79,39 @@ func (s *stateBase) selectStateFromPeer(peer *m.Peer) peerState {
if peer == nil {
return newStateNoPeer(s)
}
s.staged.controlCipher = newControlCipher(s.privKey, peer.EncPubKey)
s.staged.dataCipher = newDataCipher()
s.resetPingTimer()
s.resetTimeoutTimer()
ip, isValid := netip.AddrFromSlice(peer.PublicIP)
if isValid {
s.remotePub = true
s.staged.remoteAddr = netip.AddrPortFrom(ip, peer.Port)
s.staged.relay = peer.Mediator
}
if s.localPub && s.localIP < s.remoteIP {
return newStateServer(s)
if s.remotePub == s.localPub {
if s.localIP < s.remoteIP {
return newStateServer2(s)
}
return newStateClient(s)
return newStateDialLocal(s)
}
if s.localPub {
return newStateServer(s)
if s.remotePub {
return newStateDialLocal(s)
}
return newStateSelectRelay(s)
return newStateServer2(s)
}
func (s *stateBase) OnSyn(rAddr netip.AddrPort, p synPacket) peerState { return nil }
func (s *stateBase) OnSynAck(rAddr netip.AddrPort, p synAckPacket) peerState { return nil }
func (s *stateBase) OnAck(rAddr netip.AddrPort, p ackPacket) peerState { return nil }
func (s *stateBase) OnPing(rAddr netip.AddrPort, p pingPacket) peerState { return nil }
func (s *stateBase) OnPong(rAddr netip.AddrPort, p pongPacket) peerState { return nil }
func (s *stateBase) OnPingTimer() peerState { return nil }
func (s *stateBase) OnTimeoutTimer() peerState {
return s.selectStateFromPeer(s.peer)
}
func (s *stateBase) OnPingTimer() peerState { return nil }
func (s *stateBase) OnTimeoutTimer() peerState { return nil }
// Helpers.
@ -144,14 +143,6 @@ func (s *stateBase) selectRelay() byte {
return possible[rand.Intn(len(possible))]
}
func (s *stateBase) sendPing(sharedKey [32]byte) {
s.sendControlPacket(newPingPacket(sharedKey))
}
func (s *stateBase) sendPong(ping pingPacket) {
s.sendControlPacket(newPongPacket(ping.SentAt))
}
func (s *stateBase) sendControlPacket(pkt interface{ Marshal([]byte) []byte }) {
buf := pkt.Marshal(s.buf)
h := header{
@ -183,6 +174,117 @@ func newStateNoPeer(b *stateBase) *stateNoPeer {
// ----------------------------------------------------------------------------
type stateServer2 struct {
*stateBase
syn synPacket
publishedTraceID uint64
}
// TODO: Server should send SynAck packets on a loop.
func newStateServer2(b *stateBase) peerState {
s := &stateServer2{stateBase: b}
s.resetTimeoutTimer()
return s
}
func (s *stateServer2) Name() string { return "server" }
func (s *stateServer2) OnSyn(remoteAddr netip.AddrPort, p synPacket) peerState {
s.syn = p
s.sendControlPacket(newSynAckPacket(p.TraceID))
return nil
}
func (s *stateServer2) OnAck(remoteAddr netip.AddrPort, p ackPacket) peerState {
if p.TraceID != s.syn.TraceID {
return nil
}
s.resetTimeoutTimer()
if p.TraceID == s.publishedTraceID {
return nil
}
// Pubish staged
s.staged.remoteAddr = remoteAddr
s.staged.dataCipher = newDataCipherFromKey(s.syn.SharedKey)
s.staged.relayIP = s.syn.RelayIP
s.staged.up = true
s.publish()
s.publishedTraceID = p.TraceID
return nil
}
func (s *stateServer) OnTimeoutTimer() peerState {
// TODO: We're down.
return nil
}
// ----------------------------------------------------------------------------
type stateDialLocal struct {
*stateBase
syn synPacket
}
func newStateDialLocal(b *stateBase) peerState {
// s := stateDialLocal{stateBase: b}
// TODO: check for peer local address.
return newStateDialDirect(b)
}
func (s *stateDialLocal) Name() string { return "dial-local" }
// ----------------------------------------------------------------------------
type stateDialDirect struct {
*stateBase
syn synPacket
}
func newStateDialDirect(b *stateBase) peerState {
// If we don't have an address, dial via relay.
if b.staged.remoteAddr == zeroAddrPort {
return newStateNoPeer(b)
}
s := &stateDialDirect{stateBase: b}
s.syn = synPacket{
TraceID: newTraceID(),
SharedKey: s.staged.dataCipher.Key(),
ServerAddr: b.staged.remoteAddr,
}
s.sendControlPacket(s.syn)
s.resetTimeoutTimer()
return s
}
func (s *stateDialDirect) Name() string { return "dial-direct" }
func (s *stateDialDirect) OnSynAck(remoteAddr netip.AddrPort, p synAckPacket) peerState {
if p.TraceID != s.syn.TraceID {
// Hmm...
return nil
}
s.sendControlPacket(ackPacket{TraceID: s.syn.TraceID})
s.logf("GOT SYN-ACK! TODO!")
// client should continue to respond to synAck packets from server.
// return newStateClientConnected(s.stateBase, s.syn.TraceID) ...
return nil
}
func (s *stateDialDirect) OnTimeoutTimer() peerState {
s.logf("Timeout when dialing")
return newStateDialLocal(s.stateBase)
}
// ----------------------------------------------------------------------------
type stateClient struct {
sharedKey [32]byte
*stateBase
@ -195,7 +297,7 @@ func newStateClient(b *stateBase) peerState {
s.staged.dataCipher = newDataCipher()
s.sharedKey = s.staged.dataCipher.Key()
s.sendPing(s.sharedKey)
s.sendControlPacket(newPingPacket())
s.resetPingTimer()
s.resetTimeoutTimer()
return s
@ -203,27 +305,6 @@ func newStateClient(b *stateBase) peerState {
func (s *stateClient) Name() string { return "client" }
func (s *stateClient) OnPong(addr netip.AddrPort, p pongPacket) peerState {
if !s.staged.up {
s.staged.up = true
s.publish()
}
s.resetTimeoutTimer()
return nil
}
func (s *stateClient) OnPingTimer() peerState {
s.sendPing(s.sharedKey)
s.resetPingTimer()
return nil
}
func (s *stateClient) OnTimeoutTimer() peerState {
s.staged.up = false
s.publish()
return nil
}
// ----------------------------------------------------------------------------
type stateServer struct {
@ -240,25 +321,6 @@ func newStateServer(b *stateBase) peerState {
func (s *stateServer) Name() string { return "server" }
func (s *stateServer) OnPing(addr netip.AddrPort, p pingPacket) peerState {
if addr != s.staged.remoteAddr {
s.logf("Got new peer address: %v", addr)
s.staged.remoteAddr = addr
s.staged.up = true
s.publish()
}
if s.staged.dataCipher == nil || p.SharedKey != s.staged.dataCipher.Key() {
s.logf("Got new shared key.")
s.staged.dataCipher = newDataCipherFromKey(p.SharedKey)
s.staged.up = true
s.publish()
}
s.sendPong(p)
return nil
}
// ----------------------------------------------------------------------------
type stateSelectRelay struct {
@ -315,7 +377,7 @@ func newStateClientRelayed(b *stateBase) peerState {
s.sharedKey = s.staged.dataCipher.Key()
s.publish()
s.sendPing(s.sharedKey)
s.sendControlPacket(newPingPacket())
s.resetPingTimer()
s.resetTimeoutTimer()
return s
@ -323,26 +385,6 @@ func newStateClientRelayed(b *stateBase) peerState {
func (s *stateClientRelayed) Name() string { return "client-relayed" }
func (s *stateClientRelayed) OnPong(addr netip.AddrPort, p pongPacket) peerState {
if !s.staged.up {
s.staged.up = true
s.publish()
}
s.resetTimeoutTimer()
return nil
}
func (s *stateClientRelayed) OnPingTimer() peerState {
s.sendPing(s.sharedKey)
s.resetPingTimer()
return nil
}
func (s *stateClientRelayed) OnTimeoutTimer() peerState {
return newStateSelectRelay(s.stateBase)
}
// ----------------------------------------------------------------------------
type stateServerRelayed struct {
@ -358,19 +400,6 @@ func newStateServerRelayed(b *stateBase) peerState {
func (s *stateServerRelayed) Name() string { return "server-relayed" }
func (s *stateServerRelayed) OnPing(addr netip.AddrPort, p pingPacket) peerState {
if s.staged.dataCipher == nil || p.SharedKey != s.staged.dataCipher.Key() {
s.logf("Got new shared key.")
s.staged.up = true
s.staged.dataCipher = newDataCipherFromKey(p.SharedKey)
s.publish()
}
s.sendPong(p)
s.resetTimeoutTimer()
return nil
}
func (s *stateServerRelayed) OnTimeoutTimer() peerState {
return newStateSelectRelay(s.stateBase)
}

10
node/peer-supervisor.go
View File

@ -6,6 +6,7 @@ import (
)
const (
dialTimeout = 8 * time.Second
connectTimeout = 6 * time.Second
pingInterval = 6 * time.Second
timeoutInterval = 20 * time.Second
@ -29,11 +30,8 @@ func (rp *remotePeer) supervise(conf m.PeerConfig) {
encBuf: make([]byte, bufferSize),
}
base.pingTimer.Stop()
base.timeoutTimer.Stop()
var (
curState peerState = base
curState peerState = newStateNoPeer(base)
nextState peerState
)
@ -52,10 +50,6 @@ func (rp *remotePeer) supervise(conf m.PeerConfig) {
nextState = curState.OnSynAck(pkt.RemoteAddr, p)
case ackPacket:
nextState = curState.OnAck(pkt.RemoteAddr, p)
case pingPacket:
nextState = curState.OnPing(pkt.RemoteAddr, p)
case pongPacket:
nextState = curState.OnPong(pkt.RemoteAddr, p)
default:
// Unknown packet type.
}