josh/jrouter
josh/jrouter
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More RTMP

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This commit is contained in:
Josh Deprez 2024-04-07 16:31:19 +10:00
parent aa0268e08e
commit 71880976d9
Signed by: josh
SSH key fingerprint: SHA256:zZji7w1Ilh2RuUpbQcqkLPrqmRwpiCSycbF2EfKm6Kw
2 changed files with 112 additions and 42 deletions
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1
atalk/rtmp/data.go
View file

@ -89,6 +89,7 @@ func UnmarshalDataPacket(data []byte) (*DataPacket, error) {
nt.Extended = nt.Distance&0x80 != 0
if !nt.Extended {
// ordinary non-extended tuple
nt.RangeEnd = nt.RangeStart
if first && nt.RangeStart != 0 {
return nil, fmt.Errorf("first RTMP network tuple is not version tuple")
}

153
rtmp.go
View file

@ -8,6 +8,7 @@ import (
"gitea.drjosh.dev/josh/jrouter/atalk/rtmp"
"github.com/google/gopacket/pcap"
"github.com/sfiera/multitalk/pkg/ddp"
"github.com/sfiera/multitalk/pkg/ethernet"
"github.com/sfiera/multitalk/pkg/ethertalk"
)
@ -34,22 +35,7 @@ func (m *RTMPMachine) Run(ctx context.Context, incomingCh <-chan *ddp.ExtPacket)
continue
}
dataPkt := &rtmp.DataPacket{
RouterAddr: myAddr.Proto,
Extended: true,
NetworkTuples: []rtmp.NetworkTuple{
// "The first tuple in RTMP Data packets sent on extended
// networks ... indicates the network number range assigned
// to that network."
{
Extended: true,
RangeStart: m.cfg.EtherTalk.NetStart,
RangeEnd: m.cfg.EtherTalk.NetEnd,
Distance: 0,
},
},
}
// TODO: append more networks!
dataPkt := m.dataPacket(myAddr.Proto)
dataPktRaw, err := dataPkt.Marshal()
if err != nil {
@ -57,34 +43,23 @@ func (m *RTMPMachine) Run(ctx context.Context, incomingCh <-chan *ddp.ExtPacket)
continue
}
ddpPkt := ddp.ExtPacket{
ddpPkt := &ddp.ExtPacket{
ExtHeader: ddp.ExtHeader{
Size: uint16(len(dataPktRaw)),
Cksum: 0,
DstNet: 0, // this network
DstNode: 0xff, // broadcast packet
DstSocket: 1, // the special RTMP socket
DstSocket: 1, // the RTMP socket
SrcNet: myAddr.Proto.Network,
SrcNode: myAddr.Proto.Node,
SrcSocket: 1, // the special RTMP socket
SrcSocket: 1, // the RTMP socket
Proto: ddp.ProtoRTMPResp,
},
Data: dataPktRaw,
}
ethFrame, err := ethertalk.AppleTalk(myAddr.Hardware, ddpPkt)
if err != nil {
log.Printf("RTMP: Couldn't create EtherTalk frame: %v", err)
}
ethFrame.Dst = ethertalk.AppleTalkBroadcast
ethFrameRaw, err := ethertalk.Marshal(*ethFrame)
if err != nil {
log.Printf("RTMP: Couldn't marshal EtherTalk frame: %v", err)
}
if err := m.pcapHandle.WritePacketData(ethFrameRaw); err != nil {
log.Printf("RTMP: Couldn't write frame: %v", err)
if err := m.send(myAddr.Hardware, ethertalk.AppleTalkBroadcast, ddpPkt); err != nil {
log.Printf("RTMP: Couldn't send Data broadcast: %v", err)
}
case pkt := <-incomingCh:
@ -95,28 +70,122 @@ func (m *RTMPMachine) Run(ctx context.Context, incomingCh <-chan *ddp.ExtPacket)
if err != nil {
log.Printf("RTMP: Couldn't unmarshal Request packet: %v", err)
}
myAddr, ok := m.aarp.Address()
if !ok {
continue
}
// should be in the cache...
theirHWAddr, err := m.aarp.Resolve(ctx, ddp.Addr{Network: pkt.SrcNet, Node: pkt.SrcNode})
if err != nil {
log.Printf("RTMP: Couldn't resolve %d.%d to a hardware address: %v", pkt.SrcNet, pkt.SrcNode, err)
continue
}
switch req.Function {
case 1: // RTMP Request
// TODO
log.Print("RTMP: Got Request")
// Respond with RTMP Response
respPkt := &rtmp.ResponsePacket{
SenderAddr: myAddr.Proto,
Extended: true,
RangeStart: m.cfg.EtherTalk.NetStart,
RangeEnd: m.cfg.EtherTalk.NetEnd,
}
respPktRaw, err := respPkt.Marshal()
if err != nil {
log.Printf("RTMP: Couldn't marshal RTMP Response packet: %v", err)
continue
}
ddpPkt := &ddp.ExtPacket{
ExtHeader: ddp.ExtHeader{
Size: uint16(len(respPktRaw)),
Cksum: 0,
DstNet: pkt.SrcNet,
DstNode: pkt.SrcNode,
DstSocket: 1, // the RTMP socket
SrcNet: myAddr.Proto.Network,
SrcNode: myAddr.Proto.Node,
SrcSocket: 1, // the RTMP socket
Proto: ddp.ProtoRTMPResp,
},
Data: respPktRaw,
}
case 2: // RTMP RDR with split-horizon processing
// TODO
log.Print("RTMP: Got RDR with split-horizon")
if err := m.send(myAddr.Hardware, theirHWAddr, ddpPkt); err != nil {
log.Printf("RTMP: Couldn't send Data broadcast: %v", err)
}
case 3: // RTMP RDR for whole table
// TODO
log.Print("RTMP: Got RDR without split-horizon")
case 2, 3:
// Like the Data broadcast, but solicited by a request (RDR).
// TODO: handle split-horizon processing
dataPkt := m.dataPacket(myAddr.Proto)
dataPktRaw, err := dataPkt.Marshal()
if err != nil {
log.Printf("RTMP: Couldn't marshal Data packet: %v", err)
continue
}
ddpPkt := &ddp.ExtPacket{
ExtHeader: ddp.ExtHeader{
Size: uint16(len(dataPktRaw)),
Cksum: 0,
DstNet: pkt.SrcNet,
DstNode: pkt.SrcNode,
DstSocket: 1, // the RTMP socket
SrcNet: myAddr.Proto.Network,
SrcNode: myAddr.Proto.Node,
SrcSocket: 1, // the RTMP socket
Proto: ddp.ProtoRTMPResp,
},
Data: dataPktRaw,
}
if err := m.send(myAddr.Hardware, theirHWAddr, ddpPkt); err != nil {
log.Printf("RTMP: Couldn't send Data response: %v", err)
}
}
case ddp.ProtoRTMPResp:
// It's a peer router on the AppleTalk network!
// TODO
log.Print("RTMP: Got Response or ")
// TODO: integrate this information with the routing table
log.Print("RTMP: Got Response or Data")
}
}
}
}
func (m *RTMPMachine) send(src, dst ethernet.Addr, ddpPkt *ddp.ExtPacket) error {
ethFrame, err := ethertalk.AppleTalk(src, *ddpPkt)
if err != nil {
return err
}
ethFrame.Dst = dst
ethFrameRaw, err := ethertalk.Marshal(*ethFrame)
if err != nil {
return err
}
return m.pcapHandle.WritePacketData(ethFrameRaw)
}
func (m *RTMPMachine) dataPacket(myAddr ddp.Addr) *rtmp.DataPacket {
return &rtmp.DataPacket{
RouterAddr: myAddr,
Extended: true,
NetworkTuples: []rtmp.NetworkTuple{
// "The first tuple in RTMP Data packets sent on extended
// networks ... indicates the network number range assigned
// to that network."
{
Extended: true,
RangeStart: m.cfg.EtherTalk.NetStart,
RangeEnd: m.cfg.EtherTalk.NetEnd,
Distance: 0,
},
},
}
// TODO: append more networks!
}